The problem really is that one single metric is insufficient to grade all restaurants. 5* at a fine dining place at £150/cover is quite different to 5* at gastropub, is quite different at a chain restaurant. You can't expect to grade or interpret all restaurants on the same scale. I just interpret the star rating as overall subjective experience, which is mostly a delta from expectations.
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The problem really is that one single metric is insufficient to grade all restaurants. 5* at a fine dining place at £150/cover is quite different to 5* at gastropub, is quite different at a chain restaurant. You can't expect to grade or interpret all restaurants on the same scale. I just interpret the star rating as overall subjective experience, which is mostly a delta from expectations.