I love the book, and I'm a white, middle-aged man. Everyone has some disabiliities that can make it feel difficult or impossible to rise to ones potential. So, the principles, concepts, illustrations, and suggestions given in this book are rich--valuable--potentially precious, but only if you take them to heart and make a concerted effort to apply what you learn. Chances are if you want to get ahead, you will almost automatically put them to work right away.
As others pointed out, her aim is not to throw mentors under the bus, but to help us understand the difference between a mentor and a sponsor.
I'm glad I bought the book. I haven't put to practice what I've learned fully since I just purchased and read it, but it is helping me see things differently and I believe I will be more able to open more doors in the near future. I'm already seeing changes for the better at work.