Every single good and experienced person in the world was once inexperienced. But just because he's a rookie GM in the NHL doesn't mean that he's totally inexperienced - (He's been involved in hockey operations as a scout, agent, and GM for over half of his lifetime, remember, and spent 3 years under the guidance of Lou) - or that he doesn't understand, or even exemplify, the qualities required to be a good GM.
As for your question about rookies, my response is that no one's learned everything, and if your expectation is for someone - rookie or vet, doesn't matter - to come in and know everything, then you're setting yourself up for constant disappointment. I expect every human being to have something further to learn, and don't hold omniscience as my gold standard of hockey management.
In his time in Toronto, he's helped build a winner out of our Marlies team, having implemented a coach and system that has thrived, and in his first year as Leafs GM he signed one of the biggest unrestricted free agents ever, and acquired a top-pairing defenseman without touching our main roster or our top prospects, while also leading our organization towards a broader way of analyzing hockey in the salary cap era - Your opinion that he has no idea what the f*** he's doing is a very subjective one, and one that I certainly disagree with.
