well they said that the PC version is the one which is the most playable version, because you can change the settingsI haven't experienced any issues with low framerates on X360, I imagine that's more a PC issue.
but the PS3 is unplayable and so is the xbox...I can't say whether it's true or not but comments from users on 4players said the same thing.
and I heard that the story and movie-sequences are pretty bad and trashy and not really "cool"
well NFS:Shift will come for the PS3 "soon" and it looks awesome..I hope they'll release it for the PC too.
they say they want to insert a very realistic first person view.. (with G-forces etc)