Pink should definitely go back to R&B or like you say Sam at least have a balance between the two genres. She rebels against being "fake" but the fact that she ditched one sound completely for another just screams fake to me.

Her voice is awesome but the music she's currently making is pants, I don't mind her doing rock but she's not doing QUALITY rock music like she did quality R&B music. "Missundastood" was good but she's not been making anything decent since, so either do what you seem to do best or step your rock game up Pink...