Since Apple started releasing public beta’s there has been a consistent number of users who leave bad app reviews for apps that are not yet compatible with iOS 9 due to the fact it’s still in Beta. 

Apple has finally addressed this issue with the release of iOS 9 beta 3 and iOS 9 beta 4, by blocking iOS 9 beta users from being able to write app reviews. 

The system of blocking isn’t perfect yet though as beta users can still leave star ratings which have a significant effect on app placement. Hopefully, Apple will address this also.