Generally, whenever you get two women or a group of women together in conversation, they tend to fall into this vortex of bitching and gossiping (of course, this isn't true of ALL women). So when you put Pam and Mary Joe together, the conversation and commentating is going to get a little on the negative side. It's easy for women to compliment other women, but they're just as likely to tear each other down.
Mary Carillo seems to be of a different species. She has a great voice for commentating, and her perspective and sense of humour is great to listen to.