If you watch this for the music alone, you'll love it even if the story's a little simplified. Superb original songs which to my mind are a significant enhancement on the Motown source material. The music has an extraordinarily complex articulation which despite this, does not overshadow its soul.
I hate musicals but I was enthralled by this one primarily for the music.
I would prefer to give it 3.5 stars to be honest because I feel the whole piece lacks a certain depth.