My two cents:
I find it strange that so many people's results have such strikingly polar opposite ratings from the judges. To be frank, I think there needs to be more strict guidelines on what to look for in a person's singing that defines it as unacceptable, awful, bad, okay, good, and flawless (in respects to rankings of 0-2-4-6-8-10). I don't think I would give anyone a 10 unless they were absolutely great and you have no flaws to point out. I find it even more strange to give multiple people rankings of 10. Are you saying that you wouldn't say that a certain 10-ranked singer sang their entry better or worse than another 10-ranker?
All in all, I agree most with Ephemeral's ratings (not to single you out or anything, Eph). I find that they adhere best to the guidelines with no bias involved or anything else that might affect a score.