Ballroom is one of those shows that I categorized as dull. It was boring, too, but for all the activity on stage, it just lacked any excitement. It didn't help that the score was mediocre (i.e., one good song) or that the choreography -- although probably on-target -- was uninteresting for a lot of people. It was one of those shows that cost a lot, with all of it visible on stage, but never engaged the audience. Applause the entire evening, right through the curtain call, were tepid.
At least in those days you could tell that the audience didn't like the show any more than you did, by the indifferent applause, as compared to today, where they scream at everything.