It really irritates me when I go into a story and find that all of the comments (which are perfectly good) have a rating of 0. I've seen this a lot- it's like someone had too much time on their hands and decided to go through every story and rate all the comments down just for the hell of it, for no reason at all. It's usually not that big of a deal, but it kind of p*sses me off when the story is about a really sensitive subject, and all of the comments of encouragement to the person are rated down- what's the point of that? Shouldn't it be a good thing that there are people out there to support you when you've brought yourself to share a particularly sensitive story?
If the comments aren't horribly offensive and bad, I'll put them back to +1 (unless it's mine because I can't).
I know that the "thumbs down" is gone now, but those 0 ratings are still out there...