No, it doesn't. This shows that you can do some consumer facing and software development around an outdated commodity platform and release it. That is nontrivial and the Ouya team certainly deserves credit for it, but it is not on the same level as what Sony, Microsoft, and Nintendo do to produce their consoles. And it shows in the final product.
Also what makes you think that someone won't buy a console just to play one (really good) game?
I feel like you're wishcasting, which seems to be commonplace in Ouya discussions. What "really good" game is going to be a killer app for Ouya? The platform has very small reach and I can't see anyone with a truly promising title making it an Ouya exclusive.