What we said about it:
Killzone: Liberation ranks as one of the best action games on the PSP. The decision to emphasize tactics pays off in spades thanks to an intuitive interface for controlling Captain Templar and the Tactical Command System, where you'll get to occasionally command an AI teammate. The vehicles are a little difficult to control and the levels could be a little less linear, but it's easy to overlook these shortcomings when the rest of the gameplay is as strong as it is. The icing on the cake comes in the form of multiplayer support, both cooperatively and competitively. Whether you're familiar with the Killzone franchise or not, Killzone: Liberation deserves to be in your PSP game collection, especially if you're an action fan.
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Get Killzone: Liberation: PSP
Killzone: Liberation
Sony Computer Entertainment