It should be noted that the cast lists for 2011-12 Faust on the Metroplitan Opera website now show Poplavskaya instead of Gheorghiu. According to the New York Times, this was due to artistic reasons.
I have decided I stuck my neck out too far. I don't understand what is going on with Angela, and I can see why people would get tired of being messed with.
I still don't think she should ever have been cast in Carmen or Don Carlo, but I don't know if this is considered significant.
If I read my calendar correctly, she canceled the run of Romeo at the Met because of illness while continuing to sing Adriana in London. That does seem a bit weird. I can't claim she shouldn't sing Juliette. This is one of her specialties.
I really wanted to see her in Faust and am disappointed.