ratchet and clank size matters ?buy it?

i was wondering if i should buy it. Becuase i have played all the games previous to it.
is it as good as the games on the ps2 or should i not even bother playing it

and if not what are some good psp games that i should look ino buying

It's one of the better games for PSP but nowhere near my favorite. This is also the only R&C game I have played

The PSP game I would recommend is Crush, a very cool puzzle/platformer with good controls and nice style