I think it's a luxury to be able to carry a 3rd string QB that can play special teams teams as well as possibly special packages. And I'm not joking. And I also think it's nuts how many people forget the one season and playoff win against the Steelers. He's a decent backup to have. The rub on him is the media circus and its obvious Bill doesn't care about that. Strictly a football move.
Edit: I'm not arguing he's a starting qb, it just seems like people get off on talking about how bad he is when Cassell and Sanchez and a bunch of D2 guys in Zona, etc.. were starting last year. There are much worse options out there.