I am not sure how the stars work, but I have found that the first rating has more weight then the rest.
Examples:
If someone has a rating of one star and one rater, and I give them a rating of 5 stars. There rating will still be one star, with 2 raters.
If someone has no rating, and I rate them 5 stars, they will have a rating of 5 stars with one rater, and their rating stays high.
I have never rated anyone less than 5 stars but it looks to me like the first rating has a lot of weight.
Gunner <CAF>