Haha nice, I played MW1(Online once, I hated it D: ) first, then got Black Ops, and basically fell in love, I got MW2 and 3, and only played those a little bit, mostly the spec ops missions. I stuck to Black Ops mostly, then randomly divorced BO for MW3, and played the multiplayer a LOT on that, then since I got BlOps 2, I haven't played anything else xD Of course on all these, I've played the campaign all the way through on each of them, first.
Ah, so you're of a Black Ops guy then. I'm eager to play it, just to get that awesome playstyle in a little different setting... but mostly I played MW2 and MW3 with my girlfriend, who enjoyed doing the Special Ops with me.