I have read the book last year and I liked it so much I finished in one night. I believe there is nothing shocking about the book itself except that it is honestly relating what happened without idealization and embellishement.
The book is not all negative and in fact it made me admire the yoshinkan style and want to do one day the Senshusei course. The negative things are just the by-product, and somehow they do not surprise me as I have seen these in aikido dojos everywhere.
I have found out long ago that there is a great difference between the idealized image of aikido that we read in books and the sad reality on the ground. We are all human beings after all, and I don't believe that aikido makes a saint out of you.