Microsoft is tightening up its ratings system for indie games. Apparently this was based on user feedback.
According to Microsoft itself, "We’ve heard your feedback and have made some changes to the ratings system on Xbox.com. Starting today, only users with Xbox LIVE Gold subscriptions will be allowed to rate content on the Xbox.com website. By implementing this change, we believe our customers will experience more consistent ratings and a significantly reduced potential for abuse across the entire Xbox catalog. We have also investigated rolling back suspect votes, however, we determined it will not be possible to do this."
But there's more than just feedback... "In addition, we are investigating users who may have violated their user agreement during this series of events. Violating user agreements may result in actions up to and including banning from Xbox LIVE, removal of currently posted games, and loss of ability to post games in the future."