Right now, 4/10. Lag, OP pistols, SMGs and screw that damn Remington 870. I have a Remington 870 12ga. pump action shotgun, and is not that strong. At 40 yards you are pushing at trying to kill a turkey.
I would say if they can fix a lot of things, then it has the potential to be 8-9/10. The head glitching is something they can never fix.
Campaign: 8.5/10 (I love the story line in it, just too short.)
Zombies: 6/10 (I hate the whole bus ****. I liked the old zombies.)
Multiplayer: 6.5/10 (Pisses me off too quick. Needs improvement.)
PC (Just a quick sum of what is wrong):
No mod tools, no server browser, no VAC (At least currently), and ****** manual bans (So inaccurate)