So, I played the multiplayer for 2 or 3 hours tonight.
The game certainly improved compared to the beta. The game is smooth(er) and plays better. Sadly the game still suffers from lag (which is because of the first week I suppose). The graphics are acceptable but not that good, except for a few moments maybe.
Some stuff is really a mess... Like the customization, unlock able stuff and parties. The controls are shit as well. The game feels less polished all together and plays worse then Bad Company 2 in my opinion.
However, sound design is phenomenal, the game feels WAY better balanced (less health pool, weapons are more balanced). Destruction is fun. Also the maps... Oh my god I love them. They're freaking great (I still need to play a few though)!
All together the game is certainly fun and will be a nice multiplayer game for a while (together with Modern Warfare 3). They certainly did certain things way better this time. It's sad the game doesn't live up to the hype in certain ways (at least for me).
But hey... I have to keep in mind it's actually a PC game and it's a nice thing it even released on the Xbox.