I like Rachel Ray, but I agree about her annoying voice. I think a good deal of her attractiveness is due to her knowing how to make a really good burger. Thirty Minute Meals is usually on when I'm at the gym, and I've picked up many a burger trick from her. The rest of her dishes are kind of meh compared to her compatriots, but at least you know her ideas will be doable in less than four hours. (I'm looking at you, Giada and your "oh hey lets marinade this half the day while you set up for your party!")
As for Martha Stewart, I don't understand the appeal either. The branded houseware products are cheap and overpriced. She actually had a low end line in K-Mart for a while there. Her personality seems fake to me.