The Iliad and The Odyssey are two of the most thrilling pieces of literature available to a reader today, and they both pose difficult moral questions. I just can't imagine a sociology textbook writer formulating a "What do you think: Glory, or Contentedness?" segment as compelling as the entire arc of Achilles' role in the battle for Troy.
So yes, the lessons of the ancient world are applicable to a broad range of subjects, but the art is also valuable in and of itself.