I couldn't stand black ops, mw2 was good multiplayer, probably the most in control I've felt for a fps on console - if I wanted to quickly aim at someone I could get it right almost every time, black ops I seemed to move the stick the same amount each time but the amount the aim would move seemed to differ if you know what I mean.
Been impressed with BF3, got my platinum yesterday just in time for MW3... it's got a lot to live up to though and I may go back to BF3 afterwards, hopefully the COD people will still be on MW3 and BF3 will be more team orientated than the suicidal chaos it is at present. Loving the whole destroying buildings/cover thing - took a long time to get used the damn heli's though, first time I got in one I hit the ground after about 3 seconds.