I wasn't expecting to be convinced, only entertained, but this book abjectly failed at both. TGATGD was thoroughly BORING. The author spends half the book raising questions that he doesn't have answers to & the other half making shit refutations of his critics and then being smug at having 'proven' them wrong.
Any 'substance' that this book may claim to have is found in the first chapter as it was somewhat interesting and/or in the photos contained in the book of places most of us will probably never go.