I'm pretty lenient when it comes to games, so I don't really have a top ten, but I'll try:
- When there are too many random encounters. I don't mean that me not seeing them on the overworld (FF7), but you finish one battle, and literally two steps later, you're in another battle.
- When your characters are maxed out in stats, but they still keep fucking missing often.
- Running out of healing items because the enemy is too strong. (see next one)
- When you're fighting a boss, and it gets 3-4 moves before you even get a chance.