If I want motion then I'd play the Wii, and it'd do it a lot better. I don't get how having no controller at all could work well, it could for some but for most typical Xbox games I can't see it working well at all. Motion control is too unprecise to work by itself in most games.
Motion on the Wii only typically works well on the casual games, There's very few serious Wii games that use it or use it well. The only one that springs to mind is Resident Evil 4 that had amazing controls, probably better then the other console versions of RE4. The key is that it should be used sparingly and not relied on totally.
Also no ragging on the Wii when all you've probably played is Wii Sports (if that)
