Pre Stimulus Pack - Scrapyard and Sub Base.
Post Stimulus - Storm.
I don't play Mw2 anymore as of yesterday though. I cannot handle all of the crap that seems to just go on in that game. It's way too noob friendly to be quite, quite honest. I can understand as to WHY they did it, but there is just too much crap to use that pisses me off. I never minded noob tubes before; that was until One Man Army/Danger Close. Seriously, did that need to happen? Marathon/Light Weight/Commando Tac. Knifing isn't THAT bad but it can be annoying at times because of that lovely Commando perk.
Battlefield BC2 is better to me in my eyes, even though I used to play Mw2 all the time. I'm leaving this game a lv32 7th prestige, and may look back in a few months, maybe.