I've been following the conversation about Teresea Rebeck's somewhat-vague-but-maybe-accurate? post about story structure, creativity and craft. You can read it here. It seems to me that the question its based on is somewhat... if not entirely... faulty. I think most good- no, all good- plays marry some amount of craft and creativity together. Like Rebeck, I dislike plays that have completely ignored structural concerns, but I think it's okay for a play to have its own self-created structure (see Washburn, Anne and Grote, Jason, not to mention Churchill, Caryl).