Similar to how a page's value is judged against criteria such as uniqueness and the experience it provides to search visitors, so too does this principle apply to entire domains. Sites that primarily serve non-unique, non-valuable content may find themselves unable to rank, even if classic on and off page factors are performed acceptably. The engines simply don't want thousands of copies of Wikipedia or Amazon affiliate websites filling up their index, and thus use algorithmic and manual review methods to prevent this.
Search engines constantly evaluate the effectiveness of their own results. They measure when users click on a result, quickly hit the "back" button on their browser, and try another result. This indicates that the result they served didn't meet the user's query.
It's not enough just to rank for a query. Once you've earned your ranking, you have to prove it over and over again.
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