Nah, Desjardins is not significantly worse than say, the coach of my favourite team, Dave Tippett, who also blows playoff series with questionable decisions. But at least Desjardins and Tippett make rationally explainable decisions more than 50% of the time. Montoyo makes the WORST possible decision more than half the time. It's actually mindboggling. It'd be like if Desjardins not only didn't match lines, but he purposely left the 4th line out on the ice for 4 straight shifts.
It's not only a lack of logic and reason with Montoyo, it's that he makes decisions that are completely the opposite of what would be logical or reasonable. So not only is he not helping, he's actively hurting.
I'm not going to go too far down a Canuck/Oiler discussion in the Jays thread but you pretty clearly haven't watched Desjardins up close.
Like, there have been Canuck coaches who are kinda bad who fit what you're saying - Green, Renney, and the like. Desjardins was on a different planet. It was like watching a dad coach bantam house hockey. And yes, it was actively terrible. Single-handedly lost a playoff series. Played his 4th line more than his 1st line at ES. Brandon Sutter on a top-unit PP for all 82 games in a season. It was the most out-of-his-depth coach/manager I've ever seen in any sport.
Anyhow, Montoyo is basically the same deal. He's just this friendly clown with no clue who's on a ride with a bunch of good young players.