Put simply.. the author is at his best when supporting his views with scientific evidence, all other times his arguments lack substance and cannot be taken seriously.
In chapters (disappointingly) he makes wild and sweeping generalizations, assuming to understand the 'psyche' of nations thus taking his expedition out of the realm of science and into the realm of telepathy. The author dips in and out of the scientific method when it suits which takes power from his interesting arguments.
In fairness, the first 3/4 of the book is thought provoking and stimulating.
Forgive my ad hominem argument but if you now anything about the author please, please, PLEASE put down the book when you see the words 'Michael Jackson' ... One of the most ridiculous things you will ever read. (Page 301) ....Thanks for saving 'us' Michael.
Some interesting concepts but overall I'd reccomend something by Dawkins or Desmond Morris 'the human zoo' for example, real scientific works.