Product ratings are taken from the average of a number of whitelisted sites, and are not based only on Groupon ratings. The product UPC is sent to a service that scrapes other sites for ratings and returns a pass/fail ratings status for the product's UPC. Any products with lower than a 2.5 rating will be auto-rejected. Unfortunately, this rejection cannot be overwritten as products with lower than a 2.5 rating do not meet Groupon's quality standards.