I don't care an iota what the singer looks like. I want to hear the music and if music is anything at all, it is surely emotion. I care about tone, intonation, rhythm, diction, expression, etc. as well as acoustics. To me, looks mean absolutely nothing and that applies not just to opera, but any other kind of music on any instrument. I don't care about dancing or choreography or costumes or set designs or anything else excerpt the music. Of course, a lot of those things, if done badly, can interfere with the music, but to my mind the focus must be on the music. I don't like electronic amplification or anything electronic for that matter, because I feel that interferes with the music. (There's something about electronic instruments that lack a human soul.) Don't put anything between my ears and the artist, including microphones and speakers. I want to hear it live, not recorded. That's why acoustics are important.