Re:Monster is, without a shadow of a doubt, the single purest distillation of escapist power fantasy media I've ever encountered. This shit is literally just "guy shows up to fantasy world that's good at everything and never loses ever, gets every ridiculously overpowered ability in the universe and fucks every hot babe that crosses his line of sight".
And for that, it's a pretty good time.
I'd compare the experience of reading this thing to the experience of leveling up/getting new gear/progressing in a bog standard RPG. There are no stakes, the characters all exist in service of the protagonist, and the prose is beyond beige. Almost
every chapter SOLELY consists of the main guy describing exactly how he's constantly demolishing every enemy he comes across + fucking every babe he comes across (they like it and he has a big dick btw) + explaining every new ability he gains + explaining every "strategic" move he makes in explicit detail.
Explicit, /painstaking/ detail. Pages upon pages of text just explaining what new powers and titles he's acquired.
In a way, this extremely plain and straightforward progression is sort of satisfying, dullness in its storytelling notwithstanding.
Nothing suspenseful happens. 50 chapters in and the overarching narrative beyond his (and his clan's) personal progression is all but nonexistent.
Still a good time though, despite all of that. Re:Monster is hyper-aware of the power fantasy that it is, and is more than unabashed about it. It's very indulgent in every aspect of this guy's absolute ridiculousness, and for that it's actually enjoyable.
Just don't expect anything beyond that.