The most frustrating and exciting game seen in awhile.
The sound is amazing. Little in the way of music, but the explosions, gun fire and screaming more than make up for it.
The gameplay is where the game falls slightly short, literally, the game is very short. Also, there are so many ways you can die, and will die, its VERY frustrating. The missions are split up into a series of checkpoints wherein you can restart at the previous checkpoint upon death, but every checkpoint is a huge struggle in itself. Trial and error are your best friends here. However, there are many redeeming values. One of which, is the ability to unlock weapons and abilities to give you the edge in the battlefield. Also if you have friend with the same game you can play cooperatively via ad hoc.
All in all, it is very entertaining but trust me, you have to have patience are you risk destroying your PSP out of anger.