I've heard (on more than one occasion) people say that this is one of the weakest songs from the whole production. I'm not sure why... there's probably some musical theory about how the harmonies don't change from minor to major fast enough or something.
I don't know.
But, to me, that's why it's music and not science. It helps me to not be able to figure these things out - that way something in my life can have a little magic.