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They barely tell you anything about how good something is. Numerical scoring assumes that the quality of a film, game, etc., is uniform, or at least close enough that an average is a suitable judgement. In reality, quality is not always that consistent. Many things tend to have a mix of good elements and bad elements, and whether somebody likes it or not is a reflection of how much they can forgive the bad and savour the good. Some people try to compensate by breaking it down, but it still has the inherent problem of trying to quantify a qualitative assessment. Not all elements are emphasized equally and not in the same way in every piece of media. And really, it's ridiculous that people have to treat review scoring like grading a paper, where some technical flaw that one otherwise wouldn't care about ends up taking a fair chunk off the score. I reckon that the only thing that matters is how it made you feel in the end.
Related: don't just tell me something is awesome or that something sucks balls. The former is the easiest path towards Hype Aversion. Instead, tell me what you like or dislike about it, and then I can assess whether I'd feel the same way.
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That said, giving one's detailed opinion on the movie is best.
That scale only applies to video games. In fact, it only applies to certain high-profile games and certain websites.
Exhibit A:
http://pitchfork.com/reviews/albums/184-i-get-wet/
Exhibit B:
http://pitchfork.com/features/staff-lists/7707-the-top-200-albums-of-the-2000s-150-101/
That's because game companies pull ads when their games get low scores.
No ads=dead magazine.