i hate to be 'that guy' who says "me too", but i felt the same way when reading it 5 years ago. i had far higher expectations of a pulitzer prize winning book in non-fiction. another pulitzer prize winner that's almost as long but far more engaging is Jared Diamond's "Guns, Germs, and Steel"
GGS is an amazing read. never found a more elegant and simple explanantion of the history of mankind. in hindsight it looks perfectly rational and logical.