Seriously that game was so boss. Titles and emblems were a very exciting addition, the maps were absolutely amazing (the only ones you would not want to play are Wasteland and Derailed), everything looked polished... I would be 99% of your best COD memories would be on this game. Shame MW3 sucks balls.
EDIT: Just wanted to point out that someone has to make a thread like this atleast once a year.There will probably never be a great game like CoD 4, WaW and MW2.. But IMO my favorite was MW2, the nukes, trick shots, competitiveness..etc.
I remember always parting up with my friends to play... now it seems no one plays CoD anymore that I know... in MW2 I had a legit 54 days played.. Yes it's a lot but can't help it when it's the best game atm.
Well this is just my rant... I'm sure everyone has a story/misses the old CoD.