When I first found F95, I downloaded a lot of the games I saw, mostly because of curiosity. I still come and look, and sometimes download a game to play. Not nearly as often now. Personally, games with scat or watersports squick me out. I usually avoid Loli or Shota because that's just weird, to me. Also, Male Gay or furry stuff, because it isn't my thing. As for types of games over-represented, well, the Harem thing has been done to death. Well, if I am honest, pretty far beyond that. I tend to avoid the non-consensual stuff too. As for NTR, if it is avoidable, it can be considered one of the challenges of the game, and if not, I have seen MUCH weirder things than that that people do.
I usually read the tags that are easily visible, and then skip the ones I know I won't be interested in. If I pull up the thread because I'm not sure, I can usually tell by the description or reviews fairly quickly, and I can move on. It's one of the great things about the site!
What I never do is open a thread and then complain because the game isn't for my tastes, or has something that I don't like. That seems kind of pointless and futile to me. Now, I hate to judge those I don't know. Maybe all the vitriol over NTR is from guys who have been cheated on, and are suffering some PTSD reaction from the reminder. I don't think the message boards here are the therapy they need, but I could be wrong, I'm not a therapist. I don't think they are going to change anyone's mind though. So, in that respect, it does seem kind of pointless and futile. But, it is predictable, at least...