Already we know he's ignorant of what makes goalies good, so that's one strike against him. What ^7^ said is correct, if he wants to be in a management type position, he should have to study a lot first. These teams that are just naming former greats are playing with fire.
The biggest strike against him is that it could prove very difficult to fire him if he turns out to be a disaster. I suspect that's one of the reasons why the Rangers did not give the head coach job to Messier. So yeah, he really needs to build up some kind of track record somewhere else, although I'm not sure how former greats get experience with front office positions... is there the equivalent of a GM position for junior teams that comes kind of close to what an NHL GM has to do?
Whether he actually knows what makes goalies good, or how to evaluate one, probably doesn't have much to do with him saying that all that matters to him are wins, or at least that's what I think you're getting at. Outside of players like Luongo or Bryz, you're going to be hard pressed to find a goalie that says, "look at my save percentage, I'm really not that good anymore". For a guy that just wants to play, he'll look for anything positive to throw out there.
All this said, he'd be much better served being a television analyst. So would Devils fans.