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Step one: choose a small set of criteria
Start with four or five criteria that a viewer can actually judge: story, acting, direction, pacing and rewatch value. Give each a one-sentence definition so two reviewers read it the same way. Avoid overlapping categories, because they double count the same strength. Decide whether each criterion uses a five-point scale or a ten-point scale and keep that choice fixed. If the site serves families, add a separate suitability line for language, intensity and themes rather than blending it into the quality score. Clear definitions matter more than a long list, since consistency is what makes scores worth comparing.
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Step two: pair every number with a reason
Require one sentence of evidence under each score. A worked example: for a tense heist thriller, a reviewer gives pacing 4 out of 5 and writes that the second act tightens with every plan that goes wrong. Story receives 3 out of 5 with a note that the final twist is predictable. These short reasons let readers disagree intelligently and help editors spot careless entries. Add a spoiler-free summary field of two lines and a who-it-suits line, such as fans of slow-burn suspense. The template then produces both a score and a recommendation a stranger can act on.
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Step three: calibrate, publish and revisit
Before launching, have three people rate the same film and compare results. Where scores differ by two points or more, rewrite the criterion definition until the gap narrows. Decide how the overall rating is calculated, perhaps an average with story and acting weighted slightly higher, and state that formula on the page. Publish the template beside every review so readers see the method. Revisit it after a dozen reviews, trimming criteria that rarely change a verdict and adding one if reviewers keep mentioning the same missing idea, such as sound design or humor.