It's not true that PhoneGap cannot be used for games, not only that but it's currently the only way to have Game Center support on iOS as well as iAds and IAP.
The problem is the online building service. To reach decent (and I stress decent) you have to compile everything by yourself and edit some of the PhoneGap code for optimization, with the online build service this is not possible and result in unsitable packages.
I'm about to publish the game I made with c2 with PhoneGap only because both CoocoonJS and AppMobi are incomplete products, it is possible but it requires extensive knowledge of xCode if publishing for iOS or Eclipse for Android.
My dream would be that Ashley could edit PhoneGap (leaving all the good things such as plugins intact) to work with DirectCanvas that could really be the beginning of something great.
If I'll ever be able to finish this game I'll publish a tutorial for optimizing PhoneGap.
To potential developers, do not dismiss PhoneGap.