There is really something to that, in my opinion. Those who "get" Betty tend to really delve into (and enjoy) her recomposing and deconstructing the songs, which she does in a unique way. It was more obvious that this is what she was doing when you saw her live, I think. Her stage presence was powerful--she was the opposite of a shrinking violet, and it seemed that she was boldly taking risks with the material, which risks were interesting and enjoyable to follow. At least that is how I viewed it and heard it.
To simply dismiss her out of hand with little analysis is, in my humble opinion, like saying "that John Coltrane just ran all over his horn--I can't follow it--he's no good." Betty was a heavy artist, and if you don't get it at first, I don't think it is fair to dump on Betty.
I'm glad you agree, Hot Ptah. I think her style wnet way beyond mere mannerism.