Deffinately one of the best first-person shooters for the PSP.
(Review is only for single player mode) - I haven't played multi yet.
Gameplay: I thought commanding your assistant guy to do things was brilliant, but sometimes when breeching a door, he can throw a grenade which can bounce back out and kill you. The voice for the woman giving the mission objectives can be a bit corny. She always says "We've spotted some enemy units heading your way," and it turns out to be one or two guys. I just find her to be very annoying. The missions for campaign are alright, but could be better.
9/10
Graphics: Yuck. Even for a PSP, the graphics just suck! Deffinitely could have been worked harder on filling in more detail.
6/10
Sound: The guns are awsome. Very nicely done audio all around. The dude you command (the assistant guy) responds differently every time, Ex: Yes sir!, BOOYEAH! Im on it sir!, ect.