multiplayer on there is kind of fun since you can jump in cars and such... Huge area to play in. Biggest problem is that all the people want to play with "auto-aim" enabled. That takes all the fun out of it for me. I think that's why I like COD4 so much for multi-player.
My buddy Brian (FlutieFlake) will likely be on there tonight too. He uses one of two personas over voice chat during the game, one being a pakastani cab driver, the other being a cartoonish sergeant. Funny stuff...