I agree. The ratings system has become completely worthless since there are several people like that out there. Many people that never post and just are here for a week to give horrible ratings or people that sign up twice to do the same thing.
Meant as a way to get feedback and suggestions when you're making or building something, it has more or less degenerated into another childish opportunity to slam members of the community. Unfortunately right now, the only person that can remove things of that nature is Chad.
I think there are too many misuses of the rating system right now and the best thing to do is ignore it, because for the most part, it is no longer effective and should be given little consideration at all. Many of the worst ratings are given by members who have contributed nothing at all. There will sadly always be those people in the community(I hesitate to even call them members of the community) that are completely rude and ignorant.