I try to consume unbiased news as much as possible. I'm fortunate that I am well-versed in how to spot bias. I also try to keep up with the more biased sources. It's good to be able to see an issue from different perspectives. I often find myself amazed and wondering if people really believe some of the things they say.
A visible rating system may be helpful, but I think education on how to recognize bias would be more helpful. Otherwise, we'll still just end up taking someone's word for it regarding the degree of bias in reporting. And yes, if we could get folks to actually do research before forming and spouting an opinion that would be great!