I love competitive CoD and even tried a little bit of it in MW2 but I was too busy for it and never really tried to be in an MLG/UMG Tournament. My favorite team is OpTic and my favorite player is Scumpii.
They have two Tournaments, MLG and UMG. UMG is less organized and any team can play as long as they pay the fee. With the announcement of UMG Philadelphia in January, I was considering getting a local team to try it but I have obligations that weekend in real life and cannot attend.