How can we judge Rick Tocchet, and the success of new coaches in general?

One of the more common text messages I received in the wake of the Canucks firing Bruce Boudreau and hiring Rick Tocchet was: “Why Rick Tocchet?” Of course, the question would come after a dozen “What the hell are the Canucks doing lol”-themed messages, but the point was that Tocchet is below .500 as an NHL coach, so is he…