1. The protagonist is intelligent. And even after becoming powerful he stays that way. Yes he's a bit of a pervert, but this is a harem novel, it's necessary. He also gets a fair amount of character development. He makes mistakes, and he learns from them. He schemes, but uses force when necessary. He's a diplomat. Also, throughout the entirety of the novel, he never forgets his origin, he retains his modern perspective.
2. The best part about this novel is definitely the harem. This is probably one of the best harem novels out there. The female protagonists play a major part in the entire story. You can say that without them the protagonist would not be able to get that far. They have strengths and weaknesses. They scheme and get jealous. They are in the end very rational, hence the existence of the harem. This novel is similar to Pokémon. The protagonist is Ash and he has to travel around the world and work hard to catch those powerful Pokemons. He has to build a good relationship and then with their help he is able to challenge the world!
3. The author's writing is another reason I love this novel. Keep in mind that this novel was the first novel he wrote. It may have some flaws, but you can feel his competence as the story progresses. The interactions between the characters are really interesting. You can also feel that the author gives a lot of thought into his plots. His latest book is a good example of his growth.
4. Romance can be another plus point. Usually, cn harem novels don't put that much importance on romance and courtship. But in this novel it plays a major part. The protagonist takes his time to gain their favour. He tries various tricks and schemes to make them his. You can very well say that the whole novel is about this process.
5. The world building is also quite well done. Actually, Jin Yong has already done most of the work, but this author has done a great job of combining them into a unified whole. We have to give him credit for that.
6. Last but not least, it has a happy ending with no complicated drama.

The Best heroine, Zhao Min for me have that scenario, the MC chooses not to heal her through that method since she have someone she deeply love at that time so the MC didn't force her and in the end it took her to fell in love with our MC and got healed after 1000+ chapter. Well the main reason Qingshu didn't use the dual cultivation on her because she is his favorite character when he read the novel back from earth so he is unwilling to do that.

Yea took her that long to accept the MC, that's how hard to get girls in this novel. Especially considering she shows up at chapter 3-5 and MC only got her on mid to late 1500+ chapter

1. the battle and tension is real. It's not inferior to original works.

2. Majority of female lead fall in love with MC, and the progression is satisfying.

3. Creative retelling of many aspect in Jin Yong novel, of course because of the fusion many things are just author creative nonsense. But it is believable and can resolve some contradiction and add to world building.

4. erot*c scene is good.

1. The timeline is confusing, paradox happen.

It was not easy to fuse all Jin Yong novel in one world. For example, for the initial setting to happen, Yellow Dressed Maiden must exist, and defeat MC nominal wife before the chapter 1. But Xiao Long Nu is the number one beauty, so of course she should be virgin and MC should get her. But Yellow Dressed Maiden is originally Yang Guo and Xiao Long Nu descendant! To resolve this paradox, author create a whole new background and origin for Yellow Dressed Maiden. (which is acceptable and quite creative, but still diverge from original canon).

Many other confusing timeline also exist. One familiar with Chinese history would notice. When Southern Song, Qing, Jin, Liao, Xixia, Dali, Mongol dynasty exist at the same time, it would be confusing. It is because some of the character background tied to Song dynasty (Guo Jing, Huang Rong, Yang Guo), while some are tied to Qing dynasty (Wei Xiao Bao, Golden Snake Camp), and some beauties are tied to Xixia which is from earlier period.

Not to mention some martial art timeline. Several Beggar Sect Gang leader exist at the same time, so author must divide the beggar sect. Ming Sect exist at the same time as Sun Moon Sect. Five Champion of Hua Mountain is not the real strongest martial hero, because there are others from other period who are stronger....

Also, there are two Guo Xiang, the 1st is Zhang Shanfeng contemporaries who establish Emei Sect 100 years ago, and the other is a baby just born....

2. Geography is a mess

And so the China central plain must be divided into several competing nations. Maybe author make a map or something, but if you are not familiar with geography, it is hard.

3. Plot armor

After the 20th time of MC rescuing a beauty from getting r*ped after drinking aphrodisiac, It become unbelievable. MC just happen to always be there and all designated heroines are always safe, their virginity (if they are unmarried maiden) always protected until MC claim it.

4. Xianxia element

Minor element when MC gain teleport, can fly (limited), and use soul attack.

And kinda bullsh*t thing when Dugu Seeking Loss is alive and ascend to immortal realm. Or that Ahqing is host of goddess.

5. Inconsistency

MC character change throughout the novel. Maybe because author wrote it in the span of 6 years. Many things are not in author interest anymore and he regret writing some things. (Biggest thing is the treatment to Huang Rong)

Also, MC travel around and disappear for a while sometimes. This made it hard to track him down and communicate, especially when some people need periodical antidote only he can provide, but this is ignored by author.

Also, MC must have some kind of item box or spatial ring. He bring so much useful items that he always have them when he need it. But there is no such thing....

6. Lackluster ending

Maybe author in hurry to end the story because he has new one (Keyboard Immortal), but he just write one last long chapter summarizing the end after the last big boss died. This leave many unresolved plot point.

MC promise to Ye Erniang is forgotten, Duan Yanqing never find out about his female goddess, Linghu Chung and Yue Lingshan fate is unknown, and so on.

For example, the competing male characters are ignored. No mention of Zhang Wuji or Yang Guo after that.

Potential harem member are just left ignored. Tianshan Tonglao is foreshadowed as harem member but ignored, fate unknown. Wang Yuyan was one of the top beauty, ignored because author is wishy washy about her mother. Li Mochou was ignored. Xiaozhao just lost somewhere.

In the end MC casually added Cheng Ying to his harem without any hint. All of his harem are females that already expressed their love to him, except Cheng Ying. He just order her to enter imperial harem?

MC did 4 netori to a wife who still have living husband, err maybe more.

MC did sleep with widows maybe 5 times? In ancient china, widow is also expected to be loyal to her dead husband so this also count.

MC steal the heart of original novel heroines (Zhou Ziruo, Zhao Min, Ren Yingying, Xiao Longnu, Huo Qingtong, etc). But in this case it was more like the situation advantage, also other male incompetency and misunderstanding.

Wang Yuyan being the biggest example of such, as being someone introduced from the beginning chapters and no real end to speak of

Honestly, after the last lesbian scene where a girl was left helpless because of the MC, and the other was hypnotized by him to think the helpless girl was himself (and this was to protect the helpless girl from being r*ped... lol), but this was just after he and the hypnotized woman were going to do it... and he just left like this... and what did he expect after he was back? He first thought the helpless girl was done by a man and became pale... but after he found out that it was the hypnotized woman... he was happy... he no longer feels sorry for the helpless girl... haha...

Plus the crap with the other girl that was forced to lose her first time to save his life... and he talked about how he will treat her as his wife... but later left her to her lesbian master... so she would be taken advantage of without even realizing it... haha. When her master mol*sted her, she was scared when she still thought that her master was a man... but when she found out that her master was a woman, she was fine to go to bed with her and be mol*sted... but it was mostly because she did not understand...

- Later, when she met with the MC, he found out that she willingly did it with her master... I think the MC was angry at first, or he was acting like this... Hehe... and what did they do later... the MC and the master did the girl together... (luckily it was already censored...)

- Even more later, the lesbian master became mc's woman... but she was not a virgin... because the MC stopped for a second or something like this, she explained that she broke her own virginity... And until the end, this woman never stopped sleeping with other women unrelated to MC (even with the mother of one of mc's women.) I dunno, at least she never sleeps with mc's other women than her apprentice, or at least it was not mentioned in the novel...

So this already shows how he is fine for his women to sleep with other women which he has no intimate relationship... Of course, he won't let them sleep with men, but haha... honestly, where it was men or women, there is no difference...

After the part with the Qing dynasty, lesbianism was almost non-existent, but of course, it's because of the reason I stated below, plus the sexual scene became censored from where I read the novel...

"In the spring of the second year, Emperor Taizu of Qi, Song Qingshu and his concubines led the army to start the first Western Expedition, and the whole world began to tremble... (End of the book!) "

Dunno if I translated it right... but it's damn exciting... pity that's the ending...

And this was the most exciting of the ending chapter because the chapter was the description? of the creation of mc's empire, etc... and the following years before the Western Expedition, which is the ending of the novel...