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This is much the same as in real life, there's nothing stopping you from describing something as being better than it is because it's all subjective, so long as you aren't lying about actual facts. The real problem is that people don't understand this, the only chaos comes from people who are bothered by this fact and decide to make a post in the thread insulting their artwork. This is why there is the rule that any comments about the actual artwork should be PMed and not posted. I honestly think that if such a thing as this was implemented, we would just have people complaining about the rater's decision instead.