Right now I'm totally unconvinced that the trackpads are preferable to analog sticks in any game where aiming is big part of what you're doing. I struggled through normal-difficulty L4D2 as well, relying even on the 180-degree turn button (the right shoulder button) to navigate. Yes, I loathe the idea of using a 360 pad to play an FPS, but absent of some perfect user-created profile that I haven't downloaded yet (I'll continue to experiment with these), I'd absolutely prefer analog sticks to trackpads in first-person games.