Summary: First let me say if you still own your trusty PSP and love Ratchet and Clank from the PS2, then stop reading and god buy this game because you are missing out. This game has blow me away from the graphics, to controls, to gameplay, to story; all of which is packed into a little disc. The controls are smooth, which is one downfall of PSP, but not for this game.
Summary: I'm a big fan of the Ratchet and Clank games, as well as the Jak and Daxter games. This one is very good, I would have to say it is the best game on the PSP, maybe joint best with Grand Theft Auto: Liberty City Stories. I wasn't too impressed with the similar game Jak: the Lost Frontier, this one is much more fun, it's really great, the controls, gameplay, level design and it's not too difficult. Definite 5/5 from me for this psp game.