I don’t like the fact that users receive a banner next to their name if they get downvoted a lot. This makes other people judge negatively the comment even before reading it. I think it also encourages people to keep downvoting and discourages to upvote (as what happens with mass down votes of a comment on Reddit just for the sake of doing so).

Edit: sorry for my English, it’s not my native language + I just woke up