Beyond Rhetoric, What Makes Writing Powerful?

   Since this class was all about rhetoric and how to apply it to real life situations, I was thinking what else can be done to make a project or paper an exceptional piece of work. Of course there are the little things like formatting, grammar, and sentence structure, but there's probably a plethora of other elements to a piece of work that can make it stand out.
   Just to clarify, in my opinion a work that has good rhetoric has good ethos, pathos, and logos. So emotional appeal, credibility, and reasoning are all on the table right now. I guess what I am looking for is the sort of flair that makes certain pieces of work the best they can be. To be more clear, what is it that makes writing by George Orwell and Orson Scott Card better than other science fiction authors?
   Maybe it's just some unnameable quality that makes a larger audience appreciate the work more, but then again the reviewers of literary work or scholarly work are probably able to figure it out. But I ask you all, do you know of any other part of a piece of work that makes it that much better? Maybe I am just not that well versed in writing criticism, but it seems to me like there has to be some reason why people like some works better than others. The only other qualities that I can think of are writing style and voice. In my opinion those are pretty hard things to improve upon through taking classes, it seems to be something that some people inherently have. But then again, I'm not the expert.