I currently hate the Vietnam level in Black Ops. There's this section, where you are on top of a hit, above a trench, and a never-ending stream of Vietnamese troops keep pouring into the trench. You are directed to move down the hit, and to go into the trench, while under a constant stream of fire from Vietnamese troops. This wouldn't be so bad if your teammates ever helped you out, killed a couple of guys, maybe laid down some covering fire, used themselves as human shields to draw enemy fire, ANYTHING, but instead they just make you do all the work on your own.