I agree that C2 + CocoonJS is a good solution for Android games, especially when you consider that it's a work in progress.
I have created an admittedly simple children's game, and it's working fine on Android -- okay, I'm lazy, I only tested on Samsung Galaxy II and III :)
But so far, after overcoming lots of glitches, I'm definitely pleased with the results.
This technology is evolving rapidly and I'm sure it won't be long before we are seeing complex HTML5 games created by C2 and played on Android devices.