I wish she would do different kinds of ballads. They tend to sound Elton John-ish, especially in the vocal delivery. I would like something more along the lines of "Beautiful" or "Stay".
And of all the pop girls out there, GaGa has done the very best at creating a wide array of different sounds. That is not to say that she hasn't echoed herself before (i.e. Bad Romance and Judas), but she tends to do it FAR less frequently than her peers. You can pick any song off of ARTPOP really and not really imagine it on The Fame or the Fame Monster, indicating that there has been a progression of style and, subsequently, musical diversification.