The story, pacing and delivery were quite good - with the exception of when the narrator spoke 'HooYah'. His choice of emphasis was so out of place when reading this ever present response I almost gave up on the entire book. Alas, I recommend you try to overlook it and press on.
I enjoyed the book and the content. as someone stated before, the narrator wasn't the right choice for this type of book. He lacked zeal and didn't know some of the correct pronunciation of some of the words.