I'm not a big basketball guy, but I do remember listening to Doris Burke as a frequent guest on "Mike and Mike in the Morning."
It seemed clear to me that she was super knowledgeable about basketball, but as a guest on that show - she bored me to tears. Something about her voice and just overall lack of enthusiasm made me want to change the channel.
That said, I have seen Kirk Herbstreit many times on TV and thought he's great. But as a Mike and Mike guest - he, too, put me to sleep. He was consistently horrible.
I guess some people are more suited for TV than radio and vice versa.