In my corner of CS, there are plenty reviews of debatable use that are very negative. In fact, I have a pet hypothesis that the average score of the lower scoring but accepted papers is negative (scale from -3 to 3). And I wouldn't be surprised if the median paper's score was negative.
Positive uselessness doesn't seem like that much worse.
I’ve seen a lot of overly and unnecessarily harsh reviews. Anonymizing enables over-stating criticism, it happens routinely. I don’t think I agree that harsh critique is necessary for a healthy review system. It is already the case that good reviews are not extremely harsh, they focus on the facts and are willing to stand by their statements. I don’t personally know that many researchers who have trouble being direct in person and face to face, or of offering constructive criticism.
> As a reviewer you are only advising the editor
This completely depends on the journal or conference. Quite a few of them, especially the larger ones, do not override reviews casually nor often. And what I’m suggesting is a system where this idea can change, where editors can more easily trust the review results, and won’t need to override the decision.
> People are petty.
This might well be true. And so I’m not entirely understanding your argument. It seems to be simultaneously suggesting we have a problem, and defending the status quo as the way it needs to be. What would you suggest as a way to improve the review system so that pettiness has less influence than it does today?
You’re also misunderstanding the point of reviews. They also serve as comments to the authors to modify their manuscript and make it acceptable for publication.