This isnt eye toy. The controller is just a simpler interaction device, for all the "normal" games, and the revo games. Nothing is fun if its repeated over and over again. The interaction between you and your game is the key here. And with the revo controller, it will be all much simpler.
But, you also gets ways of interacting with the games, that has never been done before. I dont think you can compare the eye-toy to the revo controller, because it has so many more options. It isnt just made for making you move within a 3d space, its made for making the interaction with games be and look simpler.