[shrug] I enjoyed the JLI/JLU cartoons, for instance, but it's still pretty hard not to notice how Bat-centric they are much of the time. About how, at the end of the day, almost everything ends up revolving around Batman and everyone must acknowledge that he's the best of the best who's always right about everything;always in the right place at the right time.
Sure fits the criteria of a Sue to me. And I've seen people apply the term in fandom to virtually any character in a fan work who they don't know but who appears somewhat competent at what they do.