I always look forward to that one musical in December to lift my spirits, and generally rely upon either New York Theater Workshop or the Atlantic to scratch that itch (The Bands Visit, Kimberly, Once are my favourite examples). Buena Vista Social Club was that wondrous December musical I was looking for. To be clear, it has many failings, but reliving the joyous music I listened to as a teenager live was intoxicating: until this, I haven't left a show smiling ear-to-ear in quite some time.
I think this has life on Broadway (or perhaps off), but I agree that it needs a deep rewrite. An easy change: more music and less book. This production used but a fraction of Buena Vista Social Club music that is available, and left so much from the 1997 untouched. The book could easily be compressed by reducing (removing?) the story and limiting it to a series of vignettes. Buena Vista Social Club (band, album, history) is so much more than about its members. The music is the most important part. It shines well in its current state, but it could shine brighter.