I've rejected to use it for a long time, but have been forced to use it now with iOS 7. The UI is crap, the developer experience is awful and the debugging is nonexistent.
So all-in-all : it has been a kicking-and-screaming process, but now I gradually see the light, for UI where it is useful. Struts are still infinitely easier to use.
Watching the WWDC videos helped more than reading the documentation.
So I guess a lecture is welcome :-D
Axel