IDK why that is mind blowing. People review the game extraordinarily high. You expect it to be extraordinarily good. Not even close. And you ask yourself "What are these people smoking?"
Are you kidding me? The rating system on this site is broken (like most sites), without a common standard there is no way to interprete what aspects people are rating, just read some reviews man, you'll find people trashing games based on how buggy they are, on how bad the story is, but give it 5 stars because they like the boobs on the main love interest, while another might rave about the gameplay, the art, the story but give 1 star because someone else had sex that one time.
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.... WHY WASN'T THERE AN NTR TAG....ALL GIRLS ARE MINE WHETHER I KNOW THEM OR NOT."
Hell even if there was a structured standard of ratings most people will still probably rate it based purely that one factor they love or hate. Why would you expect anything else?
In this case I'd say the main reasons for loving this game IMO are the ahego sex scenes and Hunter..... come on how can you look at the mischievous face of that lovable scamp and not be drawn into the story, aren't you dying to know what hyjink he will get up to next!!
I would call this the one punch man of porn games. It thinks it's making a statement. When it's just the same thing all over again.
I'm really curious about what statement you think it's trying to make? I've never taken this as anything more than a light hearted romp.