TBH, even though I'm being retarded about the single player, it isn't a patch on MW/MW2. Although, saying that I've never really been a big fan of WWI/II shooters...I only really got this to fill a single player void, and for Nazi zombies, and already feel let down by shoddy single player.
Friendly AI is wank, theres been numerous times when my squad of 15+ people let 1 Banzai charger (quasi-rasism ftw btw Treyarch) run past everyone and stab me in the back, and as has previously been mentioned, grenades will rain down on you like...well, rain I guess. If you're lucky you might be able to throw them back, otherwise, its pretty much insta-death. Theres a lot of insta death actually now I come to think of it...artillery strikes are my favourite; no warning just boom, you're dead, as are the couple of levels that start you off in the middle of a firefight where you have to imediatly run for cover. Only you don't always make the cover AS YOU'RE IN THE MIDDLE OF A FUCKING FIREFIGHT!! Oh, and snipers...fuck the snipers. Tank level I'm on at the moment is dreadful too, but can't really comment too much as I've only just started it.
On the plus side, running around trenches with a shotgun, a flamethrower and smoke grenades was actually pretty fun! Shame that level was so short
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It's a solid 6/10 atm, IMO, maybe co-op, Nazi zombies and multiplayer will bring it up a bit but I'm not hopeful...