They still confuse me. It makes sense that the star ratings and contest rankings fluctuate like limp noodles at the beginning of a song, but one extra review can still make it jump around by more than a star even after 40 other reviews. *shrugs*
It's useful as hell for floating demos, though. You get enough reviews where you can start seeing the common threads and fix them before you release it. I just wish the scores were better indicators of how "good" a song is. It's hard to trust them when they're so volatile.