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Highlighted comments from the commenters below:
-From Shahrdad:
One critic wrote that even though Callas had learned the role in less than a week, she sang as if she had sung the role her entire life. This role is so fiendish, and it sits in such a odd spot in the soprano voice that almost everyone chokes on it. Yet somehow, it suited Callas's voice perfectly. Even in the Masterclasses, she could still sing the first aria surprisingly well, her voice sounding almost like her old self. This is vocally by far the most monumental Medea Callas ever sang. Her Scala performances were supercharged as well, but you can already hear a shrinkage of volume and a decrease in power, as Callas had lost a good bit of weight by December. She still sounded great and looked beautiful, like one of the caryatids from the Acropolis. For me, the truest of her Medeas is the Dallas one. She is much more the wronged, tortured woman, the loving wife and mother, at war with the vengeful demigoddess inside her. She was in surprisingly glorious voice (adrenaline rush I'm sure), and she was positively on fire. Florence/Scala/Dallas Medeas for me are the ultimate Callas. I rather expect one day, we might hear a Norma nearly as good as hers, but I seriously doubt there will ever be anyone who sang Medea as Callas did. She owns the role forever.

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