You don't have to be a genius to notice that a critical review of something is far more likely to get a 'no' vote than a postive one; and, even amongst positive reviews, the most votes often go to the blandest (I'm not bitter or anything...). But that's not what reviews are for, folks - just to say everything is brilliant, 5 stars. Or, as far as Amazon are concerned, is it? Should they be giving a weighting to total *number* of positive - and maybe even negative - votes, rather than just the proportion? In fact, do we need the 'no' vote at all? My experience is that it is usually dropped by people who already know the product (and for whom the review is therefore not intended), and rather than thinking it 'unhelpful' merely disagree with, and want to show their disapproval of, it. What useful purpose does the no-vote serve?
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