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You cant possibly tell all that stuff thats on 5, 4, and 3 stars by only the screenshot. I've seen maps with awesome screenshots, but the map sucked. Sometimes, like in sp maps, there isn't a good place to take a screenshot.
All I would do is just look over the map for major errors (flashing walls, floors, floating objects, etc.), then just say why you rated the map what you did. For example you gave a map a 3/5 because the map was built good but there was some minor flashing and a few gaps in walls, or something like that.
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