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Noise is by definition invalid. To restrict noise would not restrict valid ratings. Now you might want to argue there are things people should be aware of that would not fall under the objective metric of a standard evidence of theft, violation of contractual agreement, or violation of applicable laws, which is a fair point, but like other users you are inherently excluding the bad results of subjective ratings while demanding we only address the good. Anything that does not fall firmly within the objective metric can be handled with a thread in the "Reputation", "Market Discussion" or "Scam Accusation" subforums, along with a neutral rating referencing the thread. Saying that using a system that is wide open to abuse is good because it allows us to see who is abusing it is an asinine argument. Nothing would prevent these kind of judgements based on several other factors. So you are saying you would rather have the cluster fuck of constant infighting we have now because it shows who is abusive, as opposed to an objective metric that cuts out the vast majority of this bullshit before it even starts?
I'm not excluding bad results of subjective ratings, I'm saying that individuals can determine for themselves whats good or bad. Subjective ratings are fair, because everyone is free to voice their opinions and everyone is free to ignore any opinion that they don't agree with. Your definition of abuse is probably different from mine, and my definition is different from user A, user B, etc. Leaving a system wide open so people can make their own judgement is fair, because ultimately no matter the situation its your word versus someone else's. There are an uncountable number of factors that someone might want to know before deciding to trade with someone, we can't tailor rules to allow every single scenario.
The infighting we have now is among a small handful of people. Its a personal problem rather than a systemic problem. I also think its worthwhile, because people can make their own judgement from it. I think its annoying spam, but it has also been useful in deciding who's feedback is worthwhile and who is overly reactionary and not to be trusted. But, each person can form their own opinion on it.
I think a few changes should be made, such as removing any sort of numerical scoring towards the feedback system, but a lot of changes that I've wanted to see are slowly happening anyway.