Chinese opera requires subtitles to be intelligible: the music distorts the tones, I am told.
I could not stand listening to Chinese opera for more than 10 minutes, but I can't stand Western opera either, especially the bits where the soprano does that tremolo bit, that annoying warble than sounds like a cat being sent through a wringer. I can tolerate some American musicals, but many drive me out of the room.
Someone holds a screech for over 45 seconds and the audience applauds. I am aware that it is hard to do, but so it scratching a chalkboard for 45 seconds.
I think that Klingon opera in Star Trek was a sort of inside joke on opera in general.