Take Gears of War, the old Crusader games, add strategical depth and you have Killzone: liberation. I also liked the fps game, but this one is much much better. Can't believe the psp can chew this, the graphics and sound are amazing, and it even uses Havok for that extra ooomph when you are raining death on the Helgast forces. It takes a while to get used to the controls, and it kinda hurts that you cannot remap your keys, but other then that a fantastic game for the psp that can be hellishy challenging at times.

now take a look at that