She has had a few slip ups with her singing through with the Jubilee and Stand Up To Cancer thing. Her fans are so naive always defending her she is the best singer in the world. She is a great performer though and always puts on a good show.
I don't think I have seen any fan say that, on here at least. In fact, most are well aware and are ready to say she's not got the best voice. Also what are these "million" attempts? X Factor and the cameo in a film is about the only things I know she's done, and I wouldn't say the cameo was her idea of trying to "break America".