joevitus said: "I think it's the opposite--people are surprised that Wolverine sings so well. But I do think not enough consideration is given to which roles are within his range, and this can lead to a weaker vocal performance depending of the production (the Les Miz movie, for instance)."
I agree with your comment. Personally, I think Jackman sings well when the song doesn't go for high notes, but when he goes for the high notes, his voice gets nasally; and, although he makes the notes, the sound is not necessarily pleasant.
But, in this case, we are talking Harold Hill; his two big numbers are essentially patter songs, which will benefit mega from his charisma and I don't think any of them are difficult. He will be incredible.