They call it the halo effect. Over a century ago, it was discovered that officers thought that soldiers who were strong were also brave and intelligent, but those who were cowardly were also weak and stupid. Performance, ranked by entirely different measures, gave the same answers. Commanders simply thought some soldiers good and others bad.
When I get feedback on a speech, or a class, I see the same thing: the answers are all clustered at the extreme right, or extreme left, of the form. Perhaps you have filled in a hotel’s comment form. If you found the reception staff friendly, you probably also thought the bedroom was spacious and the restaurant offered good value for money.
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