I really liked the Ruskie whose name i can't remember from Call of Duty 4. You know the one who leads the Loyalist forces? He's awesome. I like how he cares about his men. ***SMALL COD4 SPOILERS AHEAD, AS IF ANYONE HASN'T PLAYED IT...*** You know like in the mission where you're there to rescue the Russian agent, and all he wants is for Soap to cover his men while they advance...and then Price and Gaz beat him up till he tells them where the spy-guy is, and he just sits there slumped...he's a really good character, and the fact that he comes to rescue you at the end just adds to his awesomeness.
I fucking hated the guy from World at War though. You know the sniper with an injured (Reznov i think)...he represents all that was evil about Russia in WW2. He's malicious, slack jawed and annoying.