While I don't own a 360 myself, I went around to a friend's yesterday and played a lot of Halo 3 multiplayer (about 4 hours worth) and I was impressed with it. Despite being the worst player there it was very fun. Much better than I expected it to be. The levels had some nice interactive elements that made the game more fun. For instance one of the multiplayer level has these little booster things that shoot you over a drop from one end of the level to the next which we all tried going over at once (many laughs when two people collided in mid-air and dropped to their deaths). I doubt I'll buy it or a 360 myself, but the multiplayer, at least, gets a thumbs up.