The multiplayer is broken, both in community and weapon balance. And when the other half of the game, the campaign, is a laughable five hours long, it does not a good game make.
You liked the online? I honestly can't see why. You either have to have super-human precognition to beat the campers, or you have to use one of five builds using the cheapest weapons in the game. Seriously, things like the G18 (a fully automatic pistol that can be dual-wielded, and at close range kills faster than a shotgun shell) make the game practically unplayable.