Above all, for them (just as for any reader), a book must make a connection with them, one that takes them to a different plane, a different level outside themselves. And don't the best books do that? Whisk you away to another world, so that you're barely aware of this one?
In one way, the editors' subjectivity sort of lets me off the hook, as a writer. There's no possible way to know how to please a specific editor. So, my job is to write what I want to write. To give the Muse what she asks for, to present my personal best. Then of course, edit it, polish it, and submit it.
And by then, the ball is no longer in my court. It's out of my hands, whether an editor will "fall in love" with my book--or not. Which is both lovely and terrifying.