I find button mashing quite boring. I've gotten more entertainment out of Wii resort's sword play than I did God of War and other similar games. However, because of sword play's major lack of pretty well everything except combat, it didn't last me very long.
Well, button mashing can be boring, but actually learning fluid button combos is really challenging. I've never gotten any more satisfaction out of a Wii game than I've ever gotten out of a normal Xbox or PC game. I mean, I guess it depends on who you are or what you want, but I really don't see motion control ever succeeding the controller.