Gershwin! Kelly! Caron! Yeesh. I know better than to expect a musical to have a realistic plotlines. Musicals are fantasy in their entirety.
I love Gershwin's An American in Paris, and I'll stop everything to watch Gene Kelly dance... but I didn't enjoy this movie. The entire dream sequence - the supposed highlight of the film - made no sense to me at all. I couldn't relate to the characters, the plot. To me, the highlight was the "I Got Music" dance number. Not worth the price of a ticket to me.