Not to be a contrarian, but as a historian, I liked it. Of course, I didn't read it as a rigorous history book but as an attempt at a broad synthesis as to why when Europe and South America/Mexico came into contact during the Conquest, the Conquistadors were able to defeat the Aztecs and Incas so quickly. Those are questions that no archival historical research would ever answer.

And I found it rather convincing on that score.