First 5 chapters are just excellent. OP gun fighter, FPS game mechanics as his personal skill, slaughtering of roman-type enemies... but then why does he start looking less and less op? He has the ability to win a war almost single-handedly but an arrow goes past his face and suddenly he's just an advanced long range mage? And he suddenly is afraid because he COULD die here? What about that awesome fight scene where he threw away all thoughts of survival for two little girls? And now they're harem members...
And any limitations that might make the story interesting (other than fear of arrows or magic) are pretty much dealt with when he levels up and gets massively broken OP skills.
Enemy are only fighting because someone more powerful than them will kill them if they don't. Terrible job making the enemy more personal and non-faceless.
Basically the ending was similarly as bad as Mass Effect 3's ending. It wasn't a choice for the reader, but it was one of those "did all of this really happen" or something like "it was all just a game the entire time". Honestly those kind of endings are the worst for me because it makes the reader (me) feel like the other red-conned the entire series that you just finished reading.
Bad stuff happening... maybe. Other worlder! I choose you! Go figure it out. Oh, and you're not OP, but very clearly are? Maybe. Its like this, that op-ness is just to get you to normal levels. WHAT?
I thought there was more to the history and background of the first world, but we didn't get exposed enough to it. MC had a history with some of the most powerful and nearly immortal beings in the world, some might even have been considered friends but for some reason both sides take an absolutely stubborn side without any further communication.
Then he becomes a lazy, jobless, shut-in that doesn't want to work or do anything in life other than die after having lived a life of leisure. Yeah he's super powerful, but for some reason lost all ability to play games? And is he powerful or is he intentionally crippling himself to remain "normal" in his/the world's eyes?
Monsters are attracted to MC and every time MC leaves the house new portals are born. Interesting idea that looks like it'll start to rope the MC back into the story. Will he go back to being a kick-ass bad-ass or will he train up the next group of "heroes"?
... near the end a strong feeling of impending and utterly complete destruction. Really feels like the author is ready to end this series.
Enjoyed the harem route. Not a Beta male MC, but just keeps getting thwarted by the loli's in his group that want him to jump them. Really pretty funny when the MC gets other characters to think of him as perverted when really he wants someone who couldn't be his own child. He even makes a full statement about using professionals, but I thought it would have been better if he had some kind of contract with the brothels for them to collect information and he pays them well and leaves them passed out. lol!
MC seems to be more like the focal point of the story. The people around him and the interactions they have with him (not him with them) and with other people seem to be the MC's.