It's not really about power though, it's more about exclusivity and uniqueness. For example, the Wii wasn't as powerful as the 360 or the PS3, but it had a unique control scheme, and exclusive games that took advantage of it at launch. No other platform offered even a remotely similar gameplay experience at the time. It has been said that some games were only possible on the PS3 (GoW 3). The Xbox 360 is best experienced with Xbox Live, which leaves other console gaming networks in the dust. The upcoming Steam Box will have Steam.

For the Ouya to "smoke" other consoles in sales, it will have to offer something unique, and that looks like a really tall order at this point.