Not too sure what to make of this.
He'll have very little time to settle in, and all it will take for us to get into even deeper shit is 2 or 3 bad results. Since there are a lot of questions about his abilities as a coach (coming from both the media & the fans), he will certainly not be getting the benefit of the doubt if & when troubles arise.
His experience could come in handy right now, so let's hope for the best, but I can't shake the feeling that this is nothing more than a panic move by the board. And those moves rarely turn out great.