Could you point me to another merchant who offered customer-readable customer reviews before Amazon? I'm not saying there isn't one, just that when we were implementing them, I was unaware of any precedents ...
When Amazon came out with real reviews, it seemed crazy to many at the time -- like why would you want to share bad things about your products on your own website? I thought it was awesome.
Amazon's customer review system was created as a barrier to entry for competitors, as much as anything else.
Perhaps I'm remembering my/people's reaction to first seeing reviews on Amazon.