Reviews for this were mixed at best. Opera aficionados seemed offended by a Broadway person, Susan Stroman, taking over the Met to do a mere operetta, and a translated one at that. They were very unkind to Renee Fleming, with some saying that she was miscast and others saying more bluntly that her voice was shot.
But as usual Kelli O'Hara received good reviews by almost all. The Times:
Ms. O’Hara’s ardent fans (put me in the front ranks of that group) will be delighted with the chance to hear her sing without the amplification requisite on Broadway. She is a vocalist with operatic training. And her tender voice carries nicely in the house — certainly as well as that of the gifted young tenor Alek Shrader, who sounded a little pinched as Camille in his scenes with her.
If you haven't seen it already this clip of Kelly with the Grisettes shows the most Broadwayish number. It shows her boisterous side: Entering tipsy and joining the kick line with women almost half her age.
https://www.youtube.com/watch?v=jxEXiUG0_tM