The MC's only motivation is to find his mom. After he finds his mom dead, his only motivation is to get revenge on the creators of the game for killing his mom. This of course makes for a boring story (you want revenge on an omnipotent God whose identity you don't even have the slightest clue about? Really?).

The characters are bland. The 3 tag-alongs to the MC are essentially... just that. They're sidekicks to accompany the MC on his missions. They have no real personality. You could replace them with robots and you wouldn't notice any difference.

The only character with an actual personality in the story is probably Jung Minji, who got killed off early on.

The MC's incredibly bland personality (I kill people who are hostile to me, also I want to get stronger) makes for extremely boring reading. At first I thought he was interested in fighting, but as the series dragged on I realized that's not true. If he was interested in fighting he would be running around challenging people to fights, but instead he's just levelling up by killing monsters, which is just typical standard webnovel stuff, and also grinding is boring to read.

The latest mission (getting dropped with some aliens or some shit) was incredibly tiresome to read about. It's basically "and now you are getting transported to this random place for no reason!". It's literally just some random event that just happens. After the first game, and the second game, now the third game, it gets tiresome and I have no idea why I should continue to care about random games that don't seem to have any consequences other than "random people will die" because I don't care about any of the characters anymore.

Themes. Motifs. Actual storytelling. It's beautiful. The main character is after revenge because of the heartless actions of the people who 'started the game' but something begins to happen, slowly. We see the MC's personality become similar to that of the people who ran the game. He begins to undervalue human life. He starts doing whatever it takes to achieve victory. Then we think, maybe he's better because he doesn't give special treatment to his own? Then he does. Not because he's sentimental, but because if the other groups want to mess with his, they should come up to their level, do the work they do, all reasons the leading races in the universe gave.

Characters aren't stagnant. The author actually makes use of his characters' personalities. Youngchin loves his childhood friend, and this is used powerfully several times.

I always thought that the complete story would start and end on earth. I also thought that other humans and monsters would be the only enemy's the protagonist has to face. Well and now Choi Hyuk is on another planet (to colonize it) and has to deal with new species.. I underestimated this novel :D

like the Berserkers who betrayed Choi Hyuk despite knowing that they would lose in the face of his powerful might after killing the monster responsible for his mother's death. These warriors were taken in because they wanted to die, so when Hyuk's enemies asked them to betray him they openly mocked those enemies for thinking they could actually kill Choi Hyuk, yet they agreed to betray him because they wanted to die anyway. Even Hyuk knew why they betrayed him because he understood them the best as one whose world no longer existed and could not hate them for it; he welcomed their betrayals and personally sent them on their way after a cool "You did well." It made me really respect both the traitors and Choi Hyuk as a leader.

He isn't improving them for them, but for himself because the ones at the top (which are obviously the subjects of his revenge) categorize the humans as a whole. In the first half of the novel, humans are "Consumables, " trash that could be thrown away anytime. In order to get more power to enact his revenge, Hyuk needs to get rid of that title to get resources. To get rid of this title, all of humanity has to improve themselves, not just Choi Hyuk and his army.

The moment his mother died, his world was over. Sure, he's a momma's boy. So what? I think that's endearing considering she was the only one in his life for 18 (?) years. The deaths following his mother's, he did care but at that point, his world was already gone so nothing else mattered--he just let their deaths become extra fuel for his revenge.

he's happy and he ended up with the best waifu in the novel

A book about a psychopath obsessed with revenge... pulled off in a very simple way... It's this simplicity that doesn't allow it rise past 3 stars. - there is a lack of depth in pysche / emotion of characters.

Furthermore, there are so many plot holes in this novel... just too many...
For example - this story later involves thousands of alien species in an alliance with technology beyond telepathy, many advance AI, interdimensional travel, etc.
AND Yet, this very alliance the MC joins and whom he also wants to take revenge on can't/never decides to read his mind, rather, they just continue to promote and just give him power?? KNOWING they themselves caused the destruction of most of humanity. - Not even a BG check....
Additionally, after seeing humans who they themselves deemed as expendables (in just a few years are) capable of fighting toe to toe with creatures who have lived millions of years with the the highest rank, yet no alarm bells ring out?... red flag... alarming potential!!

So many more plot holes as well...
However, I will say though, there is a sweet moment of revenge that makes you smile.