I think I'm a pretty adept emacs user, and I've relied at least ten times more on crappy informal documentation in blogs, StackOverflow etc. than on the real stuff.
I do that too, but out of habit from other pursuits rather than a real necessity. Recently, I've found myself going to Emacs and packages' internal help first, and I usually find what I'm looking for. Despite me spending several years not believing it, it's really good documentation for the most part.