According to ESRB, this game contains: Blood and Gore, Intense Violence
Parents should be aware that the game is gunplay from beginning to end, nothing else. Naturally, people get shot, but it's not bloody or gory despite a few slightly comical "injury" animations. The short cutscenes are marginally more explicit. There is no sexual content, and I honestly don't recall any of the "strong language" mentioned on the back of the box.
Action gamers will find a simple blastfest. There are tons of bad guys to shoot without any confusing mazes or tedious puzzles. Keyfetching is extremely minimal, and the story never slows down the assault. The game moves, but doesn't travel very far.
Multiplayer fragmeisters, there's nothing for you here. In a rather surprising turn, there's absolutely no multiplayer of any kind. A bit unexpected for a game with so much emphasis on blasting enemies, methinks.
Deaf and Hard of Hearing gamers get totally shafted not the complete omission of text during all cutscenes and mission voiceovers. The story has no bearing on gameplay, but this is still a highly disappointing choice, especially given the minimal amount of dialogue to caption.