There are certainly some valid criticisms of the coach. He overuses some players, does not use his fourth line much, and the powerplay regressed as the season went on. But some criticisms could be looked upon as positives.
He continually mixed and matched lines through much of the season as he struggled to find line combinations that worked. But while that is frustrating to fans, an NHL season is somewhat like a long war. You have to lose some battles when you try to win the war, and the only way a coach can discover which combinations work, is to experiment and find out first hand.
During the final stretch, you'll notice that Maurice did not mix and match the lines, he kept them stable. Even as some lines struggled, he did not change them during the final grind.
the good things he does and some criticism that seems to be repeating itself here this season.
http://www.canescountry.com/2011/4/11/2103110/paul-maurice-should-get-one-more-shot