This book is well and understandably written. However, I'd be surprised if linguists would find this book interesting. I'm not one and find it trivial. Most of the "myths" are nothing but prejudices, often with a tinge of racism or nationalism, and not even that interesting to begin with. Anybody with a little bit of common-sense can dismantle these myths without the help of a linguist. The only thing this book adds to that are some references to scientific literature to back up the arguments for and mainly against these myths.
It's a good enough read but after all the 5-star reviews I expected more (content, information) from it.