According to ESRB, this game contains: Blood, Mild Language, Violence
Parents should be fairly comfortable with their teens playing this game. Yes, it contains some mature themes and plenty of violence, but in this age of whores and splattering viscera, it's a charmingly restrained action game.
Fans of the first game should definitely pick this title up. Everything the first game did, this one does better.
Deaf and Hard of Hearing gamers won't have any trouble at all. Everything of importance is subtitled, and there aren't any key audio cues.