MW was great. Sunk far too much time into that game. Still unbeaten in cage matches. Lost count after 200+ games. (Winstreak of 140 to kinda back that up).
Was pretty weird though as even the kids in the lower years of my school knew me for being "the kid who's good at COD" LOL.
WaW was awesome just because of bayonets.
MW2 was horrible on PC, unless you got the pirated version that actually had its own servers (more than legit PC ones) that were not hacked and had admins

Had some good times on that beasting around getting called hax, despite me and a mate being the mods XD
But sorry acorn, BF2 is the best FPS ever. All BF games have just fallen in its shadow IMO. BFBC2 was great but something was missing, and BF3 is just BF2 merged with COD.
Suppose its just the way the gaming industry is evolving though.
Seems gamers have lost a fair few traits, mainly 1. manners, 2. patience, and 3. skill.
You could be the best player around and still killed by a noob sporting a RPG as a main weapon ¬_¬
Hence, the emergence of COD as a best seller, despite when you analyse the game it is lazy by design, and nothing innovative.