Why is your choice your favorite?  It doesn't matter if it's on the 360, PS3, PC or Wii.

Call of Duty 2 for me--it was the first game that really drove home "the next generation of games is here."

My favorite is still CoD2. I liked the single player the best and I enjoyed playing online unlike the others.

World at War. While it was the same old WWII setting, they did it quite well. Plus Nazi Zombies was just sweet, plus it was the only one that had co-op story mode.

Modern Warfare 2 and World at War. WAW has better story mode but MW2 has better online and spec ops

I prefere the first one overall (cod1) but if that ones not included, then world at war. This is simply because of nazi zombies. I don't care for waw/mw1/2 regular multiplayer.

Regarding the singleplayers.. Then I dunno. Toss op.

CoD 2 for me, without a doubt. But I still feel that the first one was also the very best one!

i like MW2 and call of duty 2, the worst is world at war.

COD4 becoz the online is so fun and addicting and the game is pretty balance except for the granades but mw2 fixed the granade issue but turn into many problems with the game lyk overpower killstreaks, unbalanced weapons, commando pro, model 1887. i would play COD4 over mw2 any day

Call of Duty 2 is easily the best Call of Duty.