I got it yesterday. Played a little in the campaign. Then I went to multiplayer, cause that's what I prefer for most games.
My biggest bitch is server problems! Christ allmighty, I could get into 1 of 10 games. The other 9 I would lose connection to the server. Not good.
So far, the rumors that this will be a Halo Killer aren't very likely, with Halo 2's seamless matchmaking.
It is so good-looking, and the campaign has already been super, it's a shame that they seem to have left the multiplayer aspect behind a touch. Hopefully it will get resolved soon.