The voices were wondrous, Verdi's music magnificent, but Damrau missed her entrance in the second act (!) and the contemporary direction by Russian Dmitri Tcherniakov was heartily booed by the upper balconies. Actually the director, Daniele Gatti, got some boos too.
I wasn't there but watched it on ARTE TV's direct transmission and saw it all. Fascinating.
Here is a picture of the opening:
Act I had some odd costumes, including Annina (Violetta's maid) jazzy bright red-haired, close cropped:
A video of the performance can be seen on ARTE, click here.