I certainly agree that Yub Nub sucks and is very anti climactic, and there are some very good scenes in the prequels.
I simply cannot stand theatrical version of ROTJ because of Yub Nub… especially when VC is so much better.
I disagree that Yub Nub is anti climatic, as it sets up TFA much better than the celebration ending. Yub Nub feels like the small victory that it really was, rather than a galaxy-wide celebration where the war is all of a sudden over because the emperor has been killed. That being said, VC is a much better piece of music, bar none.