The closest anyone has come up with is the "was this review helpful?" but that gets abused easily.
The big problem with the helpful/not helpful dichotomy as a means for rating reviewers is that it fails to take into account why the reviewer didn't find it helpful. What the system needs, IMO, is to ask a second question at that point:
Did you find the review not helpful because (check all that apply):
- It mainly covered things that I don't care about.
- I disagree with the opinion.
- It contains facts that are incorrect.
- It had nothing to do with the product/service (spam and other abuse)
A review marked with the fourth one will get flagged for review by a human, and if verified to be crap, will lower the reviewer's reputation for everyone, and will be removed.
A review marked with the third one (factually incorrect) will just lower the reviewer's reputation, but at least initially by a smaller amount than a "Helpful" vote increases it. The more reviews this occurs in, the more negatively each negative impacts that person's score, so if a person consistently lies, the negatives count more and more, until they greatly outweigh the positives. However, that balance should only tip when those negatives come from unique users (so that one user can't just mark every review by a particular reviewer as unhelpful and have a bigger impact than marking a single review that way), and those ratings should be cancelled out by a sufficient number of positive reviews, ensuring that a small number of people can't attack a reviewer by each reporting one of his or her reviews as factually incorrect.
A review marked with the first two options ("not interested" and "I disagree") will lower the reviewer's reputation, but only for that reviewer and other people whose "not interested" and "I disagree" ratings on other goods and services are statistically similar to those of the reviewer. This allows users to get better, more individualized reviews that are more likely to match their interests and concerns, without adversely penalizing other people who might be interested in and concerned about the same things as the reviewer in question. To that end, instead of "44 out of 50 people found this helpful", it would say "44 out of 50 people whose tastes match yours found this helpful", such that other users of the site might well see completely different numbers.
And users who frequently give "not helpful" ratings with more than two boxes checked, but rarely give "helpful" ratings, should have progressively smaller impact on the overall helpfulness rating for the reviews that they rate, until at some point their helpful/not helpful ratings end up getting thrown away entirely (except in their own view).