I saw Medea last night from an excellent $99 center orchestra seat -- thanks to the previous poster for the code!
The audience mostly seemed to really get caught up in the show -- hardly a cough (or any other noise), and an enthusiastic standing ovation (at least downstairs).
I, myself, liked the performances from Byrne and Cannavale. But the adapted script struck me as a bit bland and even somewhat sentimentalized, especially at the end. Without giving away any details, I would just say that the Medea character in this modern adaptation does something very significant that Euripides' Medea does not do. And that additional action felt, to me, like a way of intentionally squelching some of the most brutal and disturbing aspects of Euripides' play.