I remember a few months ago the top rated manga used to be Berserk, Yotsuba!, One Punch Man, Full Metal Alchemist and some Yaoi manga, all above or around 9.00/10. But it seems like they have been botted with hundreds of 1/10 reviews.

If you see their ratings, all of them are below 9/10 now, some taking a sharp dip to ~8.7/10. It seems like some Jojo fan botted them, seeing Steel Ball Run is the only 9+ manga, having 1% of the reviews with 1/10 rating, while others now have ~5% 1/10 reviews.

Do you guys deal with rating manipulation, or is there no way to detect the bots and remove them?

I do not represent the admins here. But if you're asking for my opinion, take it or leave it. I’m not tech-savvy enough to understand this stuff. Maybe that's something that could be considered in the feature (though I'm not sure the culprit is entirely from bots), because it's up to one person what to do with their judgment. I understand the concern of “playing” the ratings, but it's not easy to prevent the flow unless they stop themselves (in overexpressing dislike). I hope you understand what I mean.