Grinding- I never had an issue grinding levels to beat something. If you can't beat it naturally and need to grind, that is what the extra levels are for. As long as I enjoy the game, I will keep playing, grinding is a small part of it.
Long games- A game that takes over 100 hours to complete usually isn't a problem for me. Again it comes down to enjoyment. I will play as long as it is fun. A 10 hour 10/10 game isn't necessarily better than a 100 hour 10/10 game.
Excessive fanservice or nudity- I think excessive violence is worse, but that is the standard nowadays. I think the human body as an artform is much more interesting than all the graphics put into gore and blood.
Buggy games- Usually the bugs are so minor that it doesn't really matter. Sometimes the bugs can be quite entertaining and enjoyable.