Black ops has an epic campaign, but the multiplayer isn't my faforite.
Zombies is very cool too. But i don't get the crazy professor in "five". He steals my weapons but i can't kill him. And i like Dead ops arcade too. It is a cool lil' extra that you can get out of your chair and go play on a computer.
I mean, they did a great job, but it wasn't addictive as Modern warfare2. But with the bad multiplayer i would still give it an 8.5.
But overrall it is a very good game. So i would reccomment you to buy and play it!