Yeah, I wouldn't say any of it makes him a terrible coach—in the traditional sense.
But Torts' practices benefit only Torts in the long run. He can get mediocre rosters into the playoffs, but they do so with wildly unsustainable trends that limit them from actually competing once there. Hell, the whole reason they're so thoroughly f***ed on defense right now is that "just block 25 shots a game" has their defense in tatters—significant injuries here, "maintenance days" galore over there. Along the way, he often damages player relationships and diminishes player value in ways that hurt the teams' ability to get value/replace them in the long run.
For instance, it isn't a coincidence that Torts-coached teams often have the worst PP in the league. The Rangers did for a season or two under his watch, the Blue Jackets did in his time there, the Flyers are in 32nd on the PP for the second year in a row.
Part of it is talent, but a big part of it is that he offloads responsibility for it to an incompetent assistant and then absolves himself of responsibility. Even though it happens under his watch everywhere. But he's not interested in that aspect of the game or taking any heat for it—and if his teams had moderately competent PP production, they'd often increase their scoring and elevate their playoff positioning in not-insignificant ways.
As far as head coaches go, he's the limbo man. Teams with the elite talent you need to win a Cup aren't going to hire him for fear of alienating/tarnishing that talent. Teams without that talent will hire him to get more out of the spare parts they have, but that pushes them into no-man's land. Along the way, he'll piss some players off, win more games than he should, and ultimately his tenure will end with him losing the team like every other coach does eventually.
He's kind of just a waste of time. It's the Torts show, where everyone slobs on how great it is that he turned a scrappy band of 3rd liners into first round mincemeat, but the organization itself ends up just spinning its wheels during his tenure and for years after.