This game is quite frankly brilliant with a 16 mission long campaign, it makes the player actually think and interract with their environment, with something i found to be really fun- cover. although not to the extent of gears of war you still get the feeling that you are interacting with your environment.
The game has four chapters, broken down into four missions each, although i enjoyed every one of these there is so much more to it than that! You get to play it cooperatively, with another psp, you can play a variety of rather challenging challenge games, also the multiplayer let alone being able to do it via ad hoc, the recent update added another chapter AND online support allowing 8 players to battle it out in a variety of team based and free for all games.
The camera in this game is ace, only once did i want to kill myself when playin this, and i take it back now. BRILLIANT game, well worth the bargain!