How can anyone be worse than McDaniel? He's not only a bad HC but also a bad OC/playcaller; it's like being cursed twice!
As a playcaller he can't run a hurry-up offense, he can't make changes to fit a different QB, he prefers finesse and speedy little weapons over toughness and physicality, and his adjustments, if any, are ineffective because he doesn't know what he's doing. Others have posted his 3rd quarter stats, and they're way beyond pathetic. The few wins this year were most likely the result of the suggestions of others, not his decisions. The running game improved when Frank Smith left the booth and came down to the sideline and when someone suggested to McDaniel that they should use a sixth o-lineman. IOW, other coaches seem to have a better grasp of what to do than McDaniel.
And, if McDaniel should give up play calling duties and just focus on being the HC, he'd still be hurting the team. His game management sucks, he's fine with running a Club Med camp with the team unprepared to start the season, and he doesn't know the meaning of the words discipline and accountability. He doesn't bench players for poor play. Tua played like crap for a long time, but McDaniel did nothing about it, so he must have been told to bench Tua.
The bottom line is that there can't be anyone who has held a Coordinator or HC job for several years that's worse than McDaniel. Even the ex-HC of a bad team, when matched up with a competent GM and decent Coordinators has to be better than McDaniel. A smart HC with little experience would hire experienced assistants / coordinators, but McDaniel didn't do that because he's not smart when it comes to running an offense or a whole team.