Not that it is bad. And for the part I read there are some interesting anecdotes and facts... Around page 100 I started skipping pages, maybe the intention of the author for the reader was to skip whole sections, since it is/not a dictionary...
The author openly admits why the book actually exists and how it came to be, he voluntarily fulfilled a contractual obligation he did not need to. Consequently it is a mess and a missed opportunity. I will keep it on my "random page" shelf though.