Unfortunately anything related to a 'dislike' button would be abused. I don't bother with Reddit for that very reason - any opinion that is contrary to the 'norm' has a habit of being down-voted even when it's presented in a perfectly civil manner. Even in threads that specifically ask something along the lines of which character people like best. I believe Blizzard implemented a dislike function over on their forums only to later remove it due to abuse.