I work on collaborative research projects for which Evernote is already proving very useful. I think adding a star rating column would be extremely useful especially when multiple users are looking over research articles to show, for example, how relevant particular articles are. I appreciate that tags can be used in meantime, though it is cumbersome. Star fields could also have a potential to show average rating and would help researchers see what kind of articles that they would need to get to contribute further to a project. A Notes field would be able to provide clarification for any rating. Just my two cents' worth.