Picked it up at midnight release night, got home was fun for about 30 min. Then became clear that the only weapon you need to kill everyone is the chainsaw on the lancer, not so fun anymore.
MM takes about 10 min to find a match if you go in solo, then when it's over you have to find another group if your not in a private match.
Moving on to the campaign, while it's longer then the first and you get to do more neat stuff....the ending blows ass. Period. They dropped the ball on that one. It's worse then the Halo 2 ending.