At the moment I haven't even bothered looking at getting black ops, mainly because I brought MOH and it just blew me away. Sooooo much better than MW2, and makes you actually look for people as a pose to seeing a kill cam and going hunting for them. Or launching a random grenade at that sort of area.
MW2 is a good crack if you just want to run and gun, but having to duck and cover on MOH is more realistic, and the game play is just better, and more free flowing.