Instruct: Classify Amazon reviews into positive or negative sentiment
Query: poorly researched, poorly written, poorly edited

The author touches on many aspects of martial arts that are very interesting, but only glosses over them. It seems that instead of of properly researching the content, there is a lot of personal opinion and conjecture.I believe the concept or direction of the book is solid, but more time should have been put into collecting the proper information and doing it right (including having it edited).