Endless enemy spawning, like in the older COD games where enemies kept spawning until you passed a certain checkpoint.
omfg I hated that!!! I felt like I had killed the entire Nazi army by the time I was done with a level.
also hate games that force you through the introduction
I have this thing where I have to watch the cut scenes of every game. So intro's and tutorials don't bother me much.
Spawning in MW3 because it always seems they spawn right on top of you, or you spawn on them, which isn't really fair. Games where the AI sucks *** and you pwn them all the time. Examples being: Most racing games, Battlefront 2...come to think of it, most star wars AI opponents and allies suck. >.> Hopefully Fall and Battlefront 3 will be better. I am done for now. I'll be back if I have another video game peeve.