I find a drop shotter is worst than a grenade launcher kid.
Most people actually use the launcher for the shotgun challenge, only reason why I use it.
They've balanced loads of crap from mw2 as well, I've watched a couple of black ops game plays and I haven't seen a one hit kill sniper not get a one hit kill.
They've taken out marathon, or nerfed it a bit w/e. Stopped loads of random annoying crap.
They've improved from mw2 so much. go watch a gameplay vid, and you'll see it looks much more funner.