No it does not belong on the ps3. I love the game and getting close to finishing it. I love how some complain about the camera. Yea it has its problems like all games do, but it does not take away the fun from it. The wii has the first party games that Sony and Microsoft will never touch. For the wii it all comes down to the games. Its both motion and the games that is why the wii is killing the competition.
It uses the balance board Fly, so no it should not be multiplatform. Its for the Wii and i hope it stays that way.