I'm seeing a lot of unwarranted (IMO) down-moderation lately, mostly on posts that express a minority opinion or that question a majority opinion (judging minority/majority based on discussion context). As a result, there are many posts ranked -1 or 0 that probably deserve higher scores.
I'd like to remind moderators that you're supposed to "Concentrate more on promoting than demoting". In the meantime, I'm going to spend all my mod points on posts that I think have been modded down unfairly. I encourage others to consider spending some mod points in this fashion as well.
I've noticed that myself. It seems to be a recent phenomenon and I don't like it. I was really puzzled by a couple of -1 comments recently. Not great comments and I disagreed with him (or her), but that is no reason for the -1 troll rating.