So this depends on what you mean by flop doesn't it?
Some of my favourite musicals have never been long runners and some haven't made any money. That doesn't mean it's not a great musical. Stephen Ward may be a great or poor show in someone's opinion, and at the end of the day personal taste is what'll make you enjoy or dislike a show.
To be fair I think everyone who uses this board accepts that opinion is unique to each person. By flop I meant critical flop, the kind that sting.