The best part: Fiction suits. I placed mine on years ago and I haven't looked back. The prospect of entering into a fictional universe and being part of it is thrilling. Having some control of that design... a temptation too great to ignore. Check out Story Time to see how I distorted myself with fiction. (Links provided in my signature.)
The worst part: Explaining how his tripping on drugs led to a metaphysical experience that some of us readers may never understand or accept as being such. This is the only time I've felt insulted and patronized by his writings. Doing drugs is not that impressive. He describes it as if it's a great feat.
As for the rest... the book slowly becomes autobiographical while still exploring some key phases in comics and one long chapter devoted to the Batman film franchise.