The wii sold well because of its unique controller. I don't think ouya's controller is that innovative. If they only emphasize the games then it will be no match for the xbox360+kinect (which I have), let alone xbox720.
I also don't want to get another box just to play more freemium/IAP games. I really want to get away from that on Android and towards more in-depth games. So I don't know what they are thinking with loads of cheap games.
But if this is more than games, if you can check your email and facebook and all sorts of other things on your TV then it will do what other consoles can't.