He does give a disclaimer at the beginning, where he says the book is not meant to be read from beginning to end. When looked at that way, the work is somewhat more coherent.
I bought the Kindle version, and when reading on the iPad, this work really comes into its own: it's more of a collection of linked content than a book proper. The chapter notes are important, and the links to YouTube and content on his website are useful. One the iPad, I can access that content quickly and then return to where I was reading.
I will say that whatever the flaws in this work, Tim Ferris has changed two important aspects of my life forever with his two books: how I work, and now how I eat.