It is not fair if buyer gives a bad rating without giving a chance to author to resolve the issue. And in this particular case if it is not advertised in product page it is totally nonsense if user gives a 1 start rating because in general not all theme supports RTL. Envato must remove these kind of reviews. I have posted a suggestion in this regards you can have a look on it and share your views. New Feature Suggestion for Envato Rating System