I used to like Battlefield franchise as my favorite War games but the developers have messed up the game. Now my favourite war game of Call of Duty. Call of Duty : Black Ops II is my favourite so far.
Battlefield series, Call Of Duty series both on mobile phones too, Halo franchise, Gears of War series, Sniper Elite, Frontline Commando are all my favourite war games. You can add Mission Impossible too to the list.
Call of Duty will always be my number one game if I am considering games of war and violence. I've been playing Call of Duty for as long as I can remember and it is an exceptional war game.