I beat the SP campaign and it says that I'm only 50% complete...
Anyway, it's an interesting game. If you loved Call of Duty 4, then I strongly suggest you get this game.
I haven't played multiplayer yet, but from what I've heard from my dorm mates, they absolutely love it.
*I'm playing the 360 version.
it says only 50% because u only beat it on beginner or expert or just one level in order for 100% you have to beat it on 2 levels i think im not sure cause i only beat it once. And on the PS3 the multiplayer is incredible and with the new maps (most my friends say are a waste of money because of only 2 maps being good) i think its even better.