Rating: 

What I find most detrimental to this book is the NUMEROUS typos. It is sloppily edited, if it was edited at all. There are some chapters where you cannot read 3 pages without coming across 2 or more typos. A few here and there is understandable, if unprofessional. But the HUGE number of typos in this book make it embarrassing.

I think it's worth a look, but not at full price. Hence, the merely average rating.