Ryan

The narrator does an absolutely miserable job with pronunciation of chinese words - if you're familiar with China, you'll find this a bit frustrating and frequently ask yourself where he's talking about. I wouldn't expect perfect mandarin pronunciation, but you could anglicize "xinjiang" as "shin jong" (shin like the part of your leg, jong like in Mahjong). I have no idea how to write the word based on the narrator's pronunciation.
This one isn't nearly as interesting to me as Jim Roger's excellent "Adventure Capitalist" which would have been documented about 3 years earlier, and does also spend a lot of time discussing that portion of the silk road.
The book sends an especially lengthy time covering the China portion of the journey, which think many will appreciate. Last, I personally prefer that the author spend more time talking about places he went and things that he heard, and let the reader decide the emotional impact.
If you're an old china hand who's been dreaming of retracing Marco Polo's journey, I would rate this a 3 or so - you'll probably not get the coverage you're looking for. If, on the other hand, you're looking for an exotic story about a far away locale and dream of one day making this journey with a guide, then this one is 5 stars all the way.