A lot of those bad reviews seem to be from players who went into the VN with wrong expectations or did not spent enough time with the rank system to figure out the dom path.
Some seem to misunderstand the tags. One review complained that anal sex is not an option in every dom sex scenes. (There are some dom sex scenes with anal sex as an option, but it's not an option in every scene.)
One complained that femdom/maledom has to be consensual with safeword ... the tag "femdom" covers both, consensual and nonconsensual femdom, especially if there is also the tag "slave".
It's a VN, not a sandbox or simulation, so choices can only have limited impact on the story. If players want to have full impact of their choices, there is a game called Real Life.
Imho : Even wrong reviews are kind of feedback so I would not delete them, just exclude them.
I think we miss a system to mark reviews that are based too much on personal likes/dislikes or wrong expectations as not relevant (with reason) so that they do not spoil the rating. If a game has a solid technical base like KG, fair ranks should start at 3 stars, even if a player does not like the kinks in the game ... especially games for niche groups have a hard time if everybody who does not share the niche kink can simply downvote a game with a dislike.