Maybe for some people.
Marbury is trying to change his image right now and trying to better himself. It probably isn't easy for someone going through such a transition. And its one thing to have quick interviews with the media pre, during, and post game or off the street, but how many times has Marbury been on TV in that kind of "talk show" setting? The only reason why I'm defending him, is he didn't seem like he was purposely trying to reck things or look like an idiot. Granted I agree he looked like a fool, but to me it was an honest mistake.
And even if he was a 20 year vet and 39 years old, sometimes speaking is not someones skill (see Shaq or GW Bush; I'm not trying to start a political argument here or bashing our president).