I mean, I could just as easily buy an ancient game cube + a few multiplayer games for it at a yard sale with pocket change and still find more enjoyment in that than with Tower Fall.
That is a valid criticism. As a commercial product for general consumers, the OUYA is not quite there yet. It would need a broader selection of quality games before you could argue that it is a must-have for anyone other than developers.
For developers it is a much easier sell at that price. Having a console that is designed with development in mind is very appealing. I can get a GameCube, 4 GameCube controllers, and several games for the price of an OUYA. But I can't develop games for the GameCube.