I Have MW3 - had it for about 2 weeks now - have only been able to get on it, an hour or so 2 on certain week days..
I am all about the Multiplayer online, Domination etc. The new Kill Confirmed game type is pretty good too.
Level 60ish online (havent prestiged yet)
Not really fan of the campaigns, sort of lost interest in them, (with most games.. If I want a campaign type game, I prefer to get into a RPG or similar)
If I have a week off work with nothing to do maybe i'll get involved in that then, but atm, all online.