Sometimes the "version" is out of Amazon's control. Imagine all of the WiFi Router "versions" out in the field. Some will have firmware that's dreck (and complaints), and some will work well.... for a few weeks until the next crack emerges.
The biggest problem I see is that Amazon's search function is state of the art 2006. Once one finally get a user to the right product, people dash to the reviews, hoping they haven't been 'turfed, are somewhat sane, and knowledgeable, then give a user-voted credence (or not) to a product.
There are no standards to ratings, no commonality among them, and little in terms of a rational guideline to do the reviews. These changes impose a little bit of discipline, but IMHO, Amazon's search functions repel users more than the reviews attract them.