After removing the useful option to play videos inline*, Google no longer displays the duration and the rating for universal video results. Here's the same YouTube video in 2007, when Google launched universal search, and today. The only difference between video results and regular web pages is that videos have thumbnails and the options to find similar pages and to see the cached version aren't included.
I'm not sure if the rating of a video is very useful, but the duration, the date when it was uploaded and the number of views might be helpful. Google shows similar information for scientific papers, forums and this approach could be extended to other categories of web pages.
* The option to play videos results without opening a new page is available at Yahoo Search.
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