Best game with 6axis has to be Flower as it is central to the experience, but it feels so natural that you almost do not realize you are using it.
I think that LBP and KZ2 were also 'clever' in their implementation.
The worst I have seen has got to be in GTA IV where motorcycles and helis really handle disastrously. Only useful for getting the wheelie trohpy I guess :)







