XBOX 360 Modern Warfare 2 thread(*MERGED*)

Man, I really want to play army men with you guys, but I'm really terrible at console FPS. I know it's a cliche, but I just can't get over not having a mouse and a keyboard. Any PC converts here have some tips for me? Like, what sensitivity do you use? I find I turn way too slow on default, but on high, it's jerky and I have a hard time aiming. I can just imagine how hard some people must laugh when they see me drawing circles around their head with my rifle as they lock on and drop me with precision.

Oh, and does the aim down the sights "lock-on" thing that's present in the single player mode work in multiplayer? I would think that it's disabled, but sometimes I swear it locks on for me ... maybe the game feels sorry for me. I'm getting better, though. I was able to put dragon age down for a few hours last night and I hit rank 11. My kills to death ratio started out around 1:20 after an hour, but I'm closing in on 1:2 now!