I also think this game might be the best CoD game in the series. Wager matches and combat training did it for me, it's gunna be so sick. However, no zombies
I liked CoD4, but I'm pretty bored of it now, I liked WaW, but I hated the multiplayer, and I just plain don't mind MW2. It's an average game, but I still play it.
Black Ops seems like the best of all of these games, but you can do so much more. And I love what I've seen of the maps so far, they're like the WaW maps, but not as gay.