The only PS3 games I've really enjoyed so far have been Ratchet & Clank, and Resistance. R&C is a solid, fun game; probably the only real complaint with it is, it's not really a substantial evolution of the series--so if you've played the other four (?) games you might be bored / fatigued by the formula at this point. For me, I skipped over a few iterations so it stayed fresh and enjoyable.
Resistance wasn't anything particularly special, but that's not necessarily always a bad thing--it was a good "Half-lifey" first-person shooter that held my attention through the single-player campaign (which is hard to do for me) and I have a generally positive recollection of the experience sans the driving portions.