Just to be clear, i never said anything about McLellen's quality as a coach but I have said in the past that I think he's not so great with the pk, and neutral zone in particular. I had some problems with the way he had the team play defensively. However, I do recognize how obscenely good his PP and offensive zone coaching is.
I think McLellan's biggest flaw is he does not adapt well. He's a stick the plan kind of guy and staunchly refuses to make major adjustments when they are needed. This is a good strategy, until it isn't, sadly. He was constantly beaten when opposing coaches would make adjustments and the Sharks would just stick to the plan and get neutralized.
It's either that, or he's simply not good at getting his players to do what he tells them to do, and that's an even bigger problem that would get worse over time (and appeared to).
I also hugely prefer what we saw no Wednesday to what Tmac coached. Aggressive high tempo pressure the puck carrier type hockey. The Kings never had a second to breathe, the Sharks were constantly attacking them even when the Kings had the puck in the offensive zone (what little they did have it). It will bite them occasionally when someone is over aggressive and loses their man, but overall it makes your team terrifying to play against.