Seconded.
It was very... experimental, I'd say. I applaud them for the balls to try. I feel like it wasn't too far from achieving what it was going for.
Yesterday I was watching a musical episode of ST: Strange New Worlds after a few rums, and I really enjoyed it. However variety is expected from a show like Star Trek, especially because SNW sort of emulates the episodic feeling of the earlier shows.
My point being that while this particular episode was going for a jaunty positive sing-along, the Joker was probably going for something similarish but just in a dramatic and tragic sort of sense.
And the ST episode is ranked quite poorly as well, and I can see how I wouldn't always enjoy it, but yesterday I really did.
So being "forced" to watch a musical is pretty much people's problem, I think. Or seeing one without the expectation of seeing one.