The COD games are highly unbelieveable. I have a hard enough time believing that one person can kill a few hundred people without dieing. They should make it extremely hard to live, and lower the enemy count. It just makes you appreciate how many people you have in your Fireteam/Squad/Combat Team/Platoon/Company and so on more. Real warfare is based on team work. There is no loan wolf crap in it. Even snipers have their spotters.
Also they should SERIOUSLY add some other countries in. I have almost never seen Canada, New Zealand or Australia in a game. I believe Canadians were in COD 2 (or something like that), but other then that, I havent seen anything like them being in a game.
Plus, I would really enjoy it if COD strayed away from WWII and Modern Warfare. Why not Try WWI or Korea? Possibly Vietnam? I have never seen a WWI game before. Just thinking of all of those historic events makes me drool (Don't judge me. I "know" [Only the people who were there know] the reality of it, but I am sure that the game would shead some light on The "great" war.).
Thats just my 0.02 cents.