I went to a party last night where it was discussed that the famous DVD of Netrebko and Villazon in La Traviata
had the pitches corrected with auto-tune over 200 times. This
completely ignores my claim that pitch modification (highly polite term
for singing flat or sharp) is part of the singer's expressive tool kit.
It's just your opinion that they are not supposed to be doing this.
Maybe that's why the recording sounds so bland.
Footnote please see Opera Chic for news on James Levine.