Actually, I'm a complete cynic when comes to "pop" (in the broadest possible sense of the word) singers, being a listener to classical music myself (though not much opera, I admit) and quite frankly from the small amount of listening I've done Susan Boyle is a competent singer of what she sings and knows what she's doing with her voice.
Which is not what I expected.
As I said, I thought the track was from the original cast recording or similar.
In terms of being in time, I guess one person's "appropriate and sensitive rubato" is another's "complete disregard for the time signature"...