Mini games >_
Real time, where real time doesn't add anything except a twitch dimension for the sake of adding a twitch dimension to a game. If you don't have the attention span for a game, buy a fps game :-"
Voice overs just for the sake of adding voice overs. If you can't do it well, then it just detracts from the game (I swear, I'll skip the next game released with Jennifer Hale in it!)
Porting console controls to the most awkward keyboard layouts possible... what happened to combined mouse and keyboard controls.
The mysterious shrinking of game levels. Not sure if it was just something that happened from Red Faction to Red Faction 2 or a more widespread thing, but boy the sequel sucked (I've been told, but not verified, that Unreal 2 was the same thing compared to Unreal)