1. Unskippable cutscenes or scripted events, especially when placed just before a long, major encounter. god damnit.
2. Lengthy battle animations that can't be switched off (I feel the FF summon pain

).
2. Boss encounters that when you screw up and die, restart you back before the point where you actually initiated the encounter. At which point, you have to walk up the same steps/path and go through the same scripted scene again and again to initiate the battle EVERYTIME you die.
I just want the option where, if i've screwed up on a boss, i can pause the battle, and restart it from the beginning. Instead of losing, being plonked back before i initiated it, and having to physically inititate the battle again. Waste of time.
3. Games with absolutely pointless achievements, that are only there for the most desperate virtual points whores.
4. Grinding in any game. Especially when
a) you need to take several hours out to get to a respectable level to beat the next boss/move onto the next section.
b) When there aren't any suitable places to efficiently grind for large amounts of xp or whatever stat/item you need.
5. Games that repeat the same environment over and over again, and dress the different sections up with a slightly different layout, or colour scheme. (Wow, Mass Effect planet exploration).