I prefer a stylised drawn style, but as long as it looks good I'm open to anything, even Koikatsu games can look good if a dev actually puts effort into camera angles and lighting
I don't mind some grinding, but when the tasks are too long and you're just doing the exact same thing over and over and then there's no progression I get bored and quit. If you don't respect my time I'm not gonna play your game.
Also when games get too depressing, not just a little dark, but...
Rarely ever, but that's because the Harem Ending seems to get finished by devs first then I guess I just consider it completed and don't go back unless there's a specific character I like