According to ESRB, this game contains: Blood, Violence
Parents should be a little concerned—it's a fairly realistic videogame simulator, full of violence and blood. The subject matter is relatively innocuous, though, with generic multinational commandos hunting down generic multinational terrorists, as long as your teens are ready for the blood, there isn't anything morally reprehensible about it.
Xbox Live players should grab this right away—just as the previous title was, this is a stellar multiplayer experience, which shouldn't be missed by anyone who likes a nice semi-realistic shootout.
Deaf and Hard of Hearing gamers will be find the game more difficult, as they'll be missing several vital audio cues, like the clink of a grenade as it lands a few feet away, or the sound of an enemy reloading. All vital information is written onscreen, though, so the game is fully playable.