I really wish he had a clear set of references in the back of this book, though there are in-text citations. He loses some credibility with my by citing Robert Kiyosaki, because the guy is a scammer, liar, and Monday-morning quarterback.
Another thing I don't like is that everyone he mentions as success stories of open-source learning are focused and wildly successful. I am a crazy dilettante at the age of 30; I doubt that freedom to follow my passions would have given me more focus or drive. I agree that schooling sucks out tons of motivation but there are other things that do the same.
This book is a collection of essays written at different points in time, which isn't clear at first but later becomes so, and it's a whole lot less confusing once you understand that. He's clear in that he thinks that testing is useless and that the education system exists to make a bunch of people rich and everyone else dumb, and that the only way to change the system is to totally destroy it. Very libertarian thinker.