What is the author's style in On Directing Film by David Mamet?

The book, "On Directing Film" is authored by filmmaker David Mamet. The book presents his theories on making successful films. As such, he is the perfect expert to discuss his own views versus other techniques which with he has issues. Mamet proudly points out that he was not a film student. However, he gives no more credence to his own education in drama school.