The thing about Lady GaGa for me is that I wish she would have stayed doing what she was doing before she was known as Lady GaGa. I actually really liked the stuff. I think she is a very talented artist, but I feel that she isn't recognized as much for her talent anymore as she is for the crazy stuff she does.
As for rap and hip hop, I tend to enjoy a lot of it. None of which is played on the radio. Older Outkast, Astronautalis, Sage Francis, Tech N9ne, Aesop Rock, P.O.S. There are more, but I feel like the radio has given hip hop a bad name.
I know everybody has there own taste in music and I respect that, just thought I'd add my two cents.