Here the only time we see such is when someone spams these items. It's not a review so the always glowing review is removed as spam.
There should be a marketplace for extensions and look at the user reviews.
Looking for an extension that can integrate Magento store with eBay marketplace. Need a genuine review for a Magento plugin that can automate inventory and order management.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic