Pretty awesome so far, just dipped into the Single Player campaign a bit. I'm liking the story and voice acting. Persistent unit upgrades, achievements and such... I'm loving it!
I was never a huge multiplayer fan of the first game, I enjoyed LAN games more than multiplayer typically. The Co-op and challenges seem cooler to me than straight up multiplayer. With that and the single player campaign, there is plenty to keep me busy for a while.
I haven't setup my Real ID yet, but if you are playing, send me a PM on the forums.
-Z
*Good luck fielding raids this week *