I thought this was a very well done movie, driven by a very clever and thoughtful story. However, I'm not sure why it had to be in 3-D, there really aren't that many action scenes, not much special effects, so it seemed to me the 3-D was superfluous.
But the wonderful, poignant plot is what drives this story--people off all ages will enjoy it, although it is a bit slow at certain points. I loved seeing the Orsay train station before it was converted to the gorgeous museum we know today, and the beautiful scenes of Paris of course were wonderful. I do think it should have been done in French, it was odd to hear British English while all the signage was in French, but I'm sure American audiences would not have been kind to subtitles, unfortunately, or heaven forbid, learn French!