I had a friend forward me this article today and ask my opinion. The title is "in defense of being average." There are parts I agree with and parts I don't, and throughout the article I smell a strong odor of Stoicism. But the article does try to strike a balance by saying "mediocrity, as a goal, sucks. But mediocrity, as a result, is OK."
Probably an article like this helps us drill down if we consider "What would Epicurus say about "mediocrity?"