Honestly? The quality of the models. If its a 3D game and your models give me uncanny valley feelings Ill avoid it. And on the flip side, if they look so bad they dont even look human Ill avoid them.
If it has both "milf" and "incest." No motherfucker content for me. Also, any engine other than Renpy. Anything dick related when it's male protag - futa, gay, trap, etc. Futa protag too.
When the MC is just some ugly guy you have to stare at all the time.
That’s actually made me quit a game before.
Such beautiful women, paired with such a jerk. It’s unbearable.