Hi joypauline,
I think that problem stems from the fact that we don't have enough users rating in the first place. If there were more than two ratings on that one upload, each individual rating wouldn't matter nearly as much. Instead, the user would get a the average view of what people thought of his/her work.
It's important to remember that rating really has two purposes: to give feedback to the person who uploaded it, and to let other people who come to the site know what they're looking at, based on the average experience of other users. That second role is what I was hoping the rating system would really do for our users--help them sort by rating and rely on the experience of the past average user.
-Jake