I've read other reactions that claim the concept is brilliant politics, as well as decent TV. For example this piece in the CNN Politics website. Time will tell who is right.
I write to make another point, namely that more exposure isn't always positive. It is not true that the more people see of you, the more they like you.
I think Barack Obama demonstrates this can happen. He has been seriously over-exposed; many people who enjoyed watching him in 2008 won't watch him today.
Until now, Palin has seemed aware of this problem, "rationing" her appearances.