Hm, a little maybe. I think it's mostly interesting because of the animation. Not just because the pictures are beautiful, but mostly because it actually utilizes the medium. Most animated movies/series are just like regular ones, only with drawn/rendered scenes. The creators of Ef treat every scene like a a painting, with no need to stick to what could be filmed with normal actors. I really recommend this one, even if only to be amazed by the visuals.
The awesome soundtrack helps too, of course.