Encounters/fights where you are forced into a tactically unfavorable position (in multiple senses of the word)Maybe I'm just used to games where tactical positioning and stealth are just more important, but it bugs me whenever I am unable to start a fight until the game says so, and then only where the game wants me to be at the start of the fight. The example that brought this to mind is Mass Effect; there are a lot of examples where a fight only begins after a cutscene automatically teleports you (and your squad) to a predetermined position, but one particularly egregious one (some spoilers) drove me to make this:
On Noveria, after you leave Lorik Qui'in's office, you are confronted by a group of guards. Like most NPCs in the game, you can't hurt them until they initiate combat... and they only initiate combat once you speak to their leader, which teleports you directly in front of them. Since I knew they were out to get me from the moment I saw them, It would make perfect sense to open fire without a warning, but nooo. It's also a missed opportunity to use the morality system, because "fire on a group of people without even identifying them first" is a decidedly Renegade idea.
And don't say it's mechanically impossible to let you do this, because I can think of several moments in ME where you can attack neutral NPCs without giving them a first-shot advantage; they're just few and far between and not integrated into the morality system as it could be.