I've recently come across a few questions with downvotes that seemed a bit harsh; I accept everyone has a different view and it's fine to accommodate differences of opinion in a community.
I got the impression that one user in particular might be regularly downvoting because they put often derisory comments on a lot of those posts with a negative score. I checked their profile out of interest - here it is:
I'd be interested in the community's view on that ... ignore it as it'll all balance out, all of those 2855 downvotes are only one down for each question / answer? It does seem a bit of an outlier compared with other users, and to me isn't really in the spirit of what I feel AU is about - certainly not very encouraging to other users!
I'm not sure there's much of a solution to this kind of behaviour even if it's felt to be something that isn't good for the site (and maybe others don't share my view and the variation in behaviour is a good thing). I guess the alternative of censoring people who downvote too often doesn't appeal to me either. Maybe an automated alert to a user if they are downvoting more than upvoting, or something like that to get them to think before continuing?