WHEE contains what is called by many (though not in public) the best critique of Darwinism in existence. It is better than the ID approach and contains no obsessive design arguments. It quickly exposes the failure of basic Darwinism, followed by a reminder that ‘observing evolution’ is probably too difficult to arrive at the truth of propositions like natural selection.
The book then proceeds to a more controversial study of world history. In fact this extension probably gives us a glimpse of what evolution is really like in the way it straddles continents, times and places and categories of organism/culture.