And to answer your question, Infamous and Uncharted are reason enough to buy a PS3.
This is just my opinion.
Saying none is a contradictory statement. For that to be true, there would have to be NO JRPG on the PS3, but that's not true. Even if you don't think any of them are good, there is still a BEST out of them.
Oh, and TC....
Demon's Souls Dark Souls Valkyria Chronicles
Entirely yes...but then again, I'm the type of person that bought a PS2, PS3, Xbox 360, PSP, Wii, and 3DS all at different times based around just one JRPG that was out for it at the time.