Completely disagree. The team did a 180 degree turnaround when he took over, going 21-3-4 during the regular season, then beating a superior Red Wings team in the finals. Sure they caught some lightning in a bottle with the cup run, but he helped alot.
He also led the team to one of the best point totals in franchise history in 2011, when all Staal, Crosby, and Geno missed significant time. That year he won Jack Adams.
You can't tell me he's anywhere near as bad as, say, Bob Hartley or Crawford. He's definitely a better coach than Claude Julien.