Amazing singleplayer, unbalanced multiplayer.
As far as the multiplayer goes, I have to say I was highly disappointed coming from CSS and TF2. In my two weeks of playing the most common tactic I saw was grenade spamming into the spawn areas and camping. I had expected dynamic combat with varied roles, in actuality its far less interesting. The weapons (with the exception of the shotguns and sniper rifles) all feel the same in combat , which makes the LMGs the only real option unless you plan to snipe due to their large ammo capacity. Except for the different types of explosives, perks are also really uninteresting and make almost no difference in most cases.
The thing that bothered me the most is that in a game where you are unable to select servers with specific rule sets, the engine makes no attempt to match people based on similar skill levels. So in most cases people of poor and average skill are set opposed to people who are on their 5th prestige level and get massacred nearly every match.
Personally I think I am going to return this after playing the single player campaign since, IMO the multiplayer component is not enjoyable unless your skills are far better than average.