World in Conflict has some good multiplayer when it works right. Although you can technically consider it a tactics game since there is no base building, it's all unit management.
The game is basically built on 8 vs 8 multiplayer games, where each person picks a role (Armor, Infantry, Support and Air) where you have to support one another to make any progress. Air destroys Armor players, Support destroys Air, and Armor destroys Support, with the Infantry being the jack of all trades, master of none role really. You take and hold points (like a Battlefield game almost), you have a very limited population cap. The built in VOIP and reliance on teamwork can make the game extremely fun when it works right, but sadly that isn't too often.
Lack of communication among players and really, really vicious team-stacking can make the multiplayer tough to enjoy unless you're playing with friends. The reliance on teamwork means that one or two bad players on a team can ruin it by not using their role to it's potential.
I still think it has a lot of potential though, there's a multiplayer demo out there that might be worth a look.