I promise that this is not going to become an education blog, but I had to point to this Richard Feynman story
wherein he recounts his one time reviewing mathematics textbooks. (Hat tip: a commenter Jeff_H at joannejacobs.com
Textbooks which are confusing, obfuscatory or just plain wrong
are more than just a waste of money; they are a crime against the taxpayers, schoolchildren and progress itself.