For artistic use of 3D, Pina 3D was phenomenal. Too bad it's not in theaters any more, and it wasn't in wide release anyway. Can't say I was interested at all in the subject matter, but the filming techniques, angles, etc. were stunning. Truly a work of art.
So, these things are starting to happen. Let's hope they continue. I've mentioned before that I'm a fan of 3D but will agree that there's a lot of crummy 3D films out there. But we're starting to see more and more standouts. Just this year, Prometheus and Life of Pi were great examples of how 3D can serve the story and add depth not only to the images but to the story itself.