I have like 29 days in MW3. I still play it from time to time, but man, it is really, really hard. I played like two games of kill confirmed this morning and thought to myself, "How the hell did I play this so much?!"
I stood up for that game back in the day, thought it was pretty good, but looking back it is so broken. Almost MW2-OMA/DC/commando-noob-tube broken.