The only thing that annoyed the hell out of me was the one level in SC2 where u had to run around killing people, It just got on my nerves & I gave up on it!
They created the game on stealth, but on that level, u couldn't use stealth!
You start off the level, coming down a lift. When u reached the bottom there where two guards to kill.
I think that u where running across metal platforms killing loads of guards (with shallow water below the platforms). I was always getting killed at the start of the level, so I don't know much of the level to describe that well.