I think I know what you're saying, Challis. I made the mistake of saying to a co-worker that Elvis Costello can't sing. He jumped all down my throat. No, wait, I said, you don't understand. On a technical level, he sucks. On a stylistic level, he's great. I love him. I always have. I have nothing against him. Great singers don't have to be able to know how to sing.
I have never heard Norma solo so I can't comment.