I tried Ionic on Friday last week. The example code didn't work 'out of the box', and there isn't any documentation explaining how to use it. I tried with PhoneGap, with Cordova and running it in a browser both with and without Ripple. I got pretty much nowhere. Contrast that to trying jQM 1.4 RC1 and having a working example running on my phone in about half an hour with Phonegap.

Open source projects live and die on their community, which springs from examples and documentation that people can learn from. I like the look of Ionic, especially if it was decoupled from Angular, but until it's possible to actually do something with it I (and I imagine many others) can't help out with it.

tl;dr Documentation is critical. Write some, don't just rely on your "doc generator".