No, there are 0 benefits to this and it only serves to demotivates translators and nothing else. Not to mention the rating stops making sense when there are multiple translators in the group, or when the group has been going for a long time and improved their quality since then. Also, the only thing readers are able to judge translators in is how good is their English. You're not capable of judging their translation accuracy, which is the main point that a translation should be judged upon. Was already suggested before, never gonna happen.