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As I've said before, I think he has a great voice, but I certainly don't think he's a good singer.
He's a 'good singer' in the sense that he uses his voice to best effect in telling the stories he's written. The work and the instrument are almost inextricable. With his best perfomances the voice and the story told become more than the sum of their parts. On the other hand a brilliant singer can produce a flawless but meaningless performance.
As I've said before, I think he has a great voice, but I certainly don't think he's a good singer.
His advantage is obviously that most good singers sing utter rubbish. While I'm not a fan of most of his lyrics, either, for the most part they're definitely better than the standard stuff you get.