Her music is seemingly the next Britney Spears, Christina Aguilera, or whatever flavor of the month. But, her look is a mixture between high fashion and 1970's NYC alt-rock scene. She's an interesting mixture of styles.
Lady GaGa may be all about her image but she does it mostly for art. Everything she does is for art so that's why her image always comes off as over the top. The songs shes sings and the music videos she makes are different than any other artist of this generation.
I strongly believe that Lady Gaga is a very good artist, who just have a weird sence of fashion. However, I think her sense of fashion is just a gimick or a trademark to show that she is unique compare to the other artist floating around these days. I don't really think that Lady Gaga is the Anti-Christ, because according to the Bible the Anti-Christ would seem to be more like a political leader than a celebrity