Multiplayer-wise? Very Yes.
Fun as Black Ops was, I prestiged and just lost interest...
I'm pretty damn good, but it's just not fun. For no reason other than I've played it all before.
Campaign wise?
A little. Gameplay is always a bit same-y, but Black Ops played well enough with the new guns, and, for me, the gun noises (I love it that they actually sound like they're shooting bullets. Rather than MW2's BB guns.), and also new gameplay like the Helicopter.
Story, setting, and all that wise?
No. Setting, maybe, story-wise, no.
I can easily see MW2's current world shifting into a World-War 3 style one, what with the rest of NATO and Asia joining in the fight. I'd love to see some all-out warfare, but with Modern weapons.
I also think Black Ops' story is worth another two games, and I trust Treyarch will make them better than Black Ops.
If they focus more on SP, and keep MP as is other than a few new things like weapons, Killstreaks, perks, the usual shit, I'll be happy.
Hell, I'm only really playing Black Ops now because Capaign and Zombies are so fucking epic.