The reasons for optimism if we hire him are that he's been to two Super Bowls in the last decade with two different defenses, he will likely be able to assemble a pretty good staff given his reputation and connections -- and he apparently comes with a good relationship with Paton to start.
I still have my reservations given the needs on offense -- but if we weren't just coming off of Vic & VJ and instead had some young offensive coach flame out due to having no competent QBs, this move might seem more appealing. I'm not sure if our angst around getting an offensive-minded coach is really commiserate with the impact they can have -- in reality it's going to come down to the QB.
And all of that said, I'd still prefer to let the pendulum swing back to the offensive side with this hire, I think it needs more love and continuity.