According to ESRB, this game contains: Blood and Gore, Intense Violence
Parents should keep their children very far away from this game. Not only is it extremely violent, but the hero dresses up as a nazi to secretly murder Russians, so it might confuse anyone actively learning about WWII.
Online deathmatchers should check this game out, as it offers a decidedly different kind of online experience—a huge playfield open only to patient players, where camping is encouraged and no one will ever call you a sissy for selecting the sniper rifle.
Deaf and hard of hearing gamers should be mostly okay—there are onscreen markers for everything but ambient noise, meaning they'll never be able to pull off a silent shot, but otherwise they're golden.