Multiplayer is a must play!
Campaign - fun, but not the essential part of this game ( I dont necessarily consider that bad)
Multiplayer - here is where the main attraction lies. The battles are large and intense, the environments are destructible in the sense that, if that guy is being a real prick hiding in that building, sniping/camping whatever, i can put a grenade round into the building and blow open a hole exposing him to everyone. There are many unlockables and the classes feel balanced. The vehicles are important but not overpowering. The classes contain equipment and unlockables that are fun to use. Also, the squad spawning system rewards tactical gameplay rather than lone wolf charging (which i find great). I can't tell you enough how much of a blast the multiplayer is. Lets just say that if you played COD4 and enjoyed the multiplayer, i can bet you will enjoy this multiplayer even more.