The "he's no good" defensively is so massively overblown. The team sucked and he was adapting to the new league.
He leads one of the current hottest teams in the NHL in even strength ice-time and we're going to call him bad defensively? Half the time there's nothing for him to do defensively because he retrieves the puck and gets the puck forward with ease.
Advanced stats are always hit or miss, depending on which stats you like etc but there's two key ones that stick out for me.
Hutson, statistically, makes the Montreal Canadiens better when he is on the ice (ie: driving the play more), according to Corsi. Cooley, on the other hand, makes his team worse. And that's with Huston getting slightly fewer offensive zone starts and slightly more defensive zone starts.
The second stat is Point Shares, which is similar to WAR in baseball. Point Shares have Cooley as contributing the 4th most (team) points on Utah - behind Keller, Kesserling, and Sergachev. Hutson, on the other hand leads Montreal. Hutson is 22nd in the NHL in point shares, where-as Cooley comes at a still very good 128th.
And more specifically to what you mentioned - Hutson's defensive point share is actually HIGHER than his offensive point shares. On the defensive side of things, Hutson ranks 62nd in the NHL in defensive point shares, where-as Cooley ranks 225th.
TL;DR Hutson being bad defensively is completely ridiculous and unjustified.