The reaction to Mass celebrated facing east is interesting, some of those who are of the generation that new the Church 45 years ago feel it is a bit reactionary, they are wary of "turning away from Vatican 2", I don't want to be unkind but they tend to be people who have never actually read the documents, but just done "courses". Others of that age group who are quite happy because it is sign that if experimentation is to take place it is more likely to be about moving towards holiness rather than towards the bongoes, sofa and the pottery chalice.
For people who did not know the "old Church" the direction of prayer isn't a real issue, in fact most younger people seem to prefer it.
A few comments by the under 40s:
"It makes sense, Father, when you talk to us you face us, when you speak to God you stand with us."
"I prefer it, Father, it is a joy not to see your face."
"The good thing is the priest just becomes anonymous".
"It is more awesome".