Amazing. I was gonna comment that it was filled with fucked up attacks and what almost sounds like creaking in his voice, but apparently the attacks are grace notes (wow), and the creaking is just the style of the time supposed to make it sound more emotional. Quite a lovely performance.
I don't get it. He doesn't sound any more powerful than a woman soprano (that was supposed to be the point, right?). So five for cutting his nuts off for nothing.
I'm not feeling this "long live the blessed knife", bullshit either. You've got a guy who sounds like a female singer. It's a somewhat interesting freakshow oddity, but I'm not sure why it's worth going through all the trouble. It seems like a juryrigged solution for a culture that didn't want to listen to women, but still wanted to hear good music.
Imagine if Claus Nomi had been castrated pre-puberty. He'd start singing and we would hear nothing, but all the dogs in the area would suddenly weeping from the unimaginable beauty.