OK, here is my review based on the version I saw at TIFF:

There is a lot of magical song-and-dance in the movie, starting with the before-opening-credits number. However, the boy-meets-girl plot is overdone, even with the surprise ending.

Oscar prediction: most nominations, most wins (especially music / production categories), except that Best Picture will go to Manchester by the Sea or Lion or Moonlight, which have better stories.