I think that we have been contacted by the same publisher about the same book. And have the same feelings on the book and the offer to co-author it.

http://news.ycombinator.com/item?id=2926505

I was also critical of the author and outline. An unknown author with a single book on ruby to his name. The outline was poorly organised, and there wasn't anything that you couldn't get from the publicly available documentation and tutorials on the language.