Hello Larry,
Yes this is a problem for you, and could be harming your rankings. Google has hundreds of those review pages indexed from your domain already: http://goo.gl/Ey7w4c
There are a number of ways to deal with this issue, as outlined below:
1. The quickest, easiest way to get them out of the index is to use the URL Removal Tool in Google Webmaster Tools to remove the entire /reviews/ directory from the index. Then you can place a disallow statement in your robots.txt file to block the entire /reviews/ directory from being crawled and indexed again in the future. The downside of this is that you won't get much, if any, "credit" for links pointing to those review pages. However, I doubt anyone is linking to them to begin with.
2. You could put a rel canonical tag on the review pages, which would point to the product page for which the review was left. For example, http://www.audiobooksonline.com/reviews/review.php/full/0743554337/0/name/desc would have this as a rel canonical tag:
3. You could 301 redirect the review pages to the product page, as someone else suggested, but I think this would cause all sorts of unintended errors and redirects on your reviews platform. I don't recommend this route.
4. You could use a noindex,follow meta tag on the review pages.
Googlebot and Mozbot, and their respective indexes, behave differently. You're not always going to get the exact same numbers from GWT that you get from Moz.com. Use Moz.com to identify critical issues on your site, rather than expecting it to give the same broken link count, 404 error, duplicate page count, etc... as Google.
I hope this helps give you some options. Also, I recently wrote an article that I think might help you:
eCommerce Product Review Solutions
Good luck!