From the other reviews on this site, much has obviously been made of the fact that this book contains 'racist' themes. I've now read this book three times, and have never got the impression that the author's intent was to cause any offence to any country, race or culture.
In fact, Stephenson pokes as much fun at the 'Neo-Victorians', and their overly pompous pastiche of 19th century British life, as he does at the other 'philes' featured in the book. What he creates is a rich cast of futuristic characters which, to my mind at least, represent caricatures, rather than indictments, of various regional personalities and their inherent traditions. In doing so he fashions something far more feasible among the fantasy genre than many other, more extreme utopian/dystopian, visions.
The range of ideas explored is fantastic, ranging from the moral to the philosophical to the scientific. Although the ending is indeed disappointing and somewhat unbelievable - even for a science fiction book - in the context of the rest of the story, the main body of the tale should keep you more than a little hooked.