Quoted from swinks:
I can understand both sides of the issue, maybe if the up / down vote feature remained - an idea is the person giving the up or down votes has a counter on their profile so if they end being a serial downvoter they are highlighted. So when you open the counter to see who is downvoting their little picture has a red ring around it ???. It might make them more accountable for being a serial downvoter.
as for what makes a serial downvoter: maybe a person that down votes more than up votes, or downvotes more than makes posts (contribution to the forum) or a combination of the 2. Might help mods quickly identify trouble makers.
ready for the downvotes
So down voting rather than replying is a troublemaker? It's easy to just disagree and click, that makes you less of a trouble maker than actually staying a disagreement here which is basically not allowed.