I'm impressed that the author could make such an intellectual topic interesting and even funny at times. It is a mindful and engaging book rather than a casual read. If you're not willing to step into it and do a little work, this book may not be for you. Personally, I loved it and thought it was transformational.
It seems likely to me that those who have written dismissive or disrespectful things about the book were not able to appropriately engage its content.