Remove or Rewrite Duplicate Descriptions. Pages with duplicate Meta tags will never make it in the indexes of search engines and cause overall poor site rankings!
Use unique and descriptive Description tags across all pages of your site, because SEs use them as snippets on the search results pages. As an option, you may leave the duplicate Description tags intact but use a "canonical" attribute on the non-canonical pages to let the search engines know which one is the preferred page.
One of the metrics search engines use to rank is the website's quality. After Google made the Panda update a part of its regular algorithm, unique content has become vitally important for high rankings.