The book is good. It explains things that a reader \ "watcher" might be interested in and have their own suspicions. Very good chapter on sources of the novel. However, some chapters are too brief or shallow.
A nice perspective on the characters and happenings of the ice and fire series. Well written, but i would have prefered less chapters about fan fiction and more about other characters. The party about connections to old myths and european cultures was quite interesting though,