One of the better manga out there, but it depends fully on your own particular preferences, fetishes and what you're actually looking for.
Some will hate this and it's painfully obvious, others will love it. That's because this doesn't try to tick the "acceptable" boxes of the broadest audience, it panders to a particular niche. If you're not part of it, don't even try to read it and honestly I'm not sure why you would even try to read it and then give a bad score when it provides what it's said to provide. That's pretty much like a dude reading a shoujo manga and complaining it's too girly.
This manga is made for people who:
1: Loves erotic scenarios/ecchi manga
2: Loves the idea of willing monster girls of various races and personalities typical of said races throwing themselves at the protagonist.
3: Doesn't mind the protagonist being unable to resist said girls in the end for one reason or another or being a "pushover" about it. He actually tries to resist but fails spectacularly due to blackmail, magic, unfortunate traps, being drugged and just being a bit weak when it comes to resisting.
4: Likes their protagonists to actually have redeeming features like, in this case, being extremely strong and actually using it when needed, only that he doesn't use brute force against the girls, he's not a beta mc, he's just weak to beautiful women pushing themselves on him with various methods. He's actually likable and have a personality and background that makes it reasonable for women to be after him. He often screws himself over with "bursts of genius" that tend to only be good short term solutions.
5: It's especially good if you enjoy the idea of a harem and you don't mind "cheating" in a manga where it really brings no bad effects nor sorrow to anyone or drama in general. The "fiancée" is just used for comedy and doesn't interfere with the story much. She's much too innocent to catch on and doesn't even know what sex is and despite having it explained to her where babies come from, she refuses to believe it and thinks god sends babies with storks, she refuses to accept reality due to her upbringing and personality.
6: Likes when things are 100% comedy. This is nothing but a comedy manga with a bizarre setting and it's true to its core. There is never any drama, it's always wacky and funny and everything always solves itself somehow. Because it stays true to being a comedy all the way through, any unrealistic and illogical parts are fine, because they're meant to be just that. It's not serious, it's just a fun adventure of more and more girls joining the ever growing harem that he, despite his grievances, keep on gathering.
Personally, I loved reading this. Despite being more of a sadist myself while peter leans more towards being a masochist, I liked peter and the girls. Sex is treated very casually in this story. For a comedy purpose, this setting is just way better, because a guy going around raping girls is more doujinshi territory than comedy. Here, instead, we have a guy who has strong genes and who keeps on getting "raped", but he's actually kind of willing. If he TRULY refused, he wouldn't have any real issue in taking the forceful route. Although not all of them, at least most of the situations in this manga could be avoided if he used his powers, especially the part where the girls keep on sticking around. But he's not that kind of dude and he doesn't hate the girls at all, rather it appears to me he grows some feelings for them. Yeah, the reverse rape setting is sure to turn some people off, that's why they give it shit scores, but these people clearly knew before reading it that it wasn't going to be something they like since it's clear from the start what's going to happen and this isn't for them.
If you feel like this kind of stuff would be right up your alley, then please give it a try. If you hate cheating, even if it's painted in a very lighthearted way with zero consequences except comedy, if you hate reverse rape, pushy girls, harems or a mc that can't seem to set down his foot and use force if necessary to say no, then please don't read it. It was never intended for you, so go read some monogamy themed pure love comedy instead.
Oh, by the way, just want to mention this in response to a certain negative review to clarify some false points. First of all, while he's certainly not proactively going into it, it's clear as day that while the harem is, at least initially, unwanted, it's not "very unwanted", he barely resists. There has yet to be a single time (except for once when dealing with a certain ugly goblin queen where he actually, begrudgingly, enjoyed it even then) where he was TRULY raped. Keep in mind that this guy is the acknowledged strongest man. Every single time, he, at the end, made the conscious decision to go through with it, he was never forced in the true meaning of the word, and every single time, he enjoyed it and this is why he doesn't feel any ill will, self-pity or anything else, he just feels shame because he doesn't have enough willpower. Secondly, male villains? What male villains? There are literally no real villains in this story, it's 100% comedy. The only "villains" he could be talking about is his fiancée's father, who's ridiculously overprotective and tries to screw him over but fails every time, it's just some light, stupid plotting in the background and a lot of funny pissed off faces. None actually do anything directly to him or his girls. It's all just fun stuff, perhaps this dude was so pissed by it not fitting his fetishes and he felt so offended that everything grated him the wrong way, been there, done that, but it's unfair to the author to spout what is essentially lies because of it.