I've played MW2 on both 360 and PS3, and from my experiences, players on the 360 were a lot more "cheap", for lack of a better word. Seemed like every game had a glitcher, or multiple noob tubers, and everything else people hate.
Not to say that PS3 doesn't have that, but it seems to be a lot less common.
So yeah, I know what you mean. PS3 FTW.