Thank you very much for your thorough thoughts, explanation, and your answer to my problem.
Just want to put my thoughts into words here so maybe this conversation can help others that are in the same shoes. The answer to the one question that you've raised, “do users benefit from your site?”, is an idea that I'm trying to prove. You are correct, the site does not provide real unique content except trying to improve user experience to help explore recent product releases on Amazon.com.
This is a niche product because most people are interested in the popular releases and not interested in browsing hundreds of releases (popular or not) by their release date but I believe there are enthusiasts that may benefit from this site. I want to benefit the people that are not just looking for the popular releases. But again, this is yet to be proven.
Thanks for sharing some great ideas to help improve my site. I will keep the review and user generated content concept in mind.