For me, my game is working great with the OUYA. I'm using phonegap since the ability to make a controller plugin is what i need. I don't think Cocoonjs allows this, but i never looked.
Currently the OUYA only recognizes Left, Right, Up, Down, and Return from the controller for HTML5 games. To use all of the buttons and to allow multiple controllers at once, a phonegap plugin is needed.