Happened to me awhile back, not sure why. I never played the game in the public, I only bought it to play private with some friends. I always wondered if it was because I changed it to a windowed game instead of full screen once because my PC was pumping out the music and MW2 wont allow you to minimize in a game lobby or game. Well if so, that's not against their policy, I checked.
When it happened I just kind of laughed, I wasn't a big fan anyway. I liked the damage modifiers better than BFBC2, but the fact that every gun had absolutely no sway kind of pissed me off. Then again putting half a light machine gun magazine in someone charging at you only to die first by a rifle grenade in BFBC2 pisses me off too.