Literature as Moral Medium?

Nussbaum is maintaining that literature is the best medium for investigating and conveying ethical philosophy.

I think that for the virtues of literature there is typically a corresponding vice: Articulating the ineffable occurs, when it does, at the price of precision; increased effect and import is bought at the cost of unreliablilty. While identifying a specific metaphor as being about other metaphors may be done with a certain degree of certainty, well written literature, as a rule, is less clear than a well written treatise. Using indirect communication can be powerful when it is successful, but the successful transfer of information is less reliable than straight forward prose.

I think great literature often has great philisophical ideas. This may be even the reason the literature is great. For more on this, I believe it is the topic of Nicole's next year Commonwealth Thesis. My contention is that I am not sure literature is the best medium for ethical philosophy.