Poorly written, tendentious, underwhelming.
Pinker better stick to what he knows best (i.e. cognitive psychology), instead of rambling thru subjects for which he is not qualified to write on or form an informed opinion (such as nuclear energy policy, international peace and security, criticism of Nietzsche, etc.).
Overall, it felt that the book was written by a high school kid, rather than a university prof.
Abysmal!