Yeah, I was against it at first, because I don't like options being taken from me, but the more I think about it, the more it makes sense.
The whole idea is based on the false equivalency that upvotes and downvotes are equal, when in fact people feel negatives much more strongly, and they also tend to have an oversized impact, like mentioned by OP.
Yeah, I was going to pick it up, until I saw that.