Just got thist cart for $10 on eBay. I have have only played about 1 hour, but the technical things people have complained about such as framerate and loading times are non-issue so far. PS3 games load much slower, and it isn't an FPS so the framerate doesn't seem to affect anything. I am using the touch screen controls, which seems to fix the camera, so that may help with the framerate.
I would also like to mention, that the demo for this game didn't grab me at all. I mean why would they have the demo start 5 minutes after opening sequence. The openening sequence really grabs you. I didn't finish demo, but I am really enjoying the full game. Give it a chance.