As with everything else in life, TV Tropes has articles on this:
8.8 - Television Tropes & Idioms
Four Point Scale - Television Tropes & Idioms
And, of course, there's an xkcd for it too:
Scores are ok if the reviewer explains how they grade things on their site, but they probably get too much attention on the whole. I haven't read all of Jiro's article yet but I suspect I'll agree with a lot of it.
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