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I dread the day when restaurant and product reviews take this approach.
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I assume you're talking about professional reviews, in which case we can assume some thought has gone in to the judgement. But anything average score becomes less and less useful the more people who contributed to it.
I read (or at least skim) Amazon reviews rather than just looking at the number. It's much more useful that way, as you can take in to account differing tastes.