He wasn't bad.
Things he has been bad at: making ad hoc adjustments that ended up costing us. I'm not counting the Cardinals game or even the Fins game. Those two games are forgivable. Both good teams. You can't control three offensive linemen being absent the day before the game.
The offense in general was bland. He didn't begin the season playing into Dak's strengths. He didn't design the scheme around the skill players strengths. Cooks, for instance, wasn't used correctly and still may not be being used 100 percent correctly. I think you should hand it to Cooks or use Cooks in screens once or twice a game. But really scheme to get him open.
Lack of using skill players in the run-game, i.e., like San Fran.
Insisting on using Parsons at DE in the run game. Instead of a DE who's stronger in the run-game and utilizing Parsons lateral speed and size at LB to stop the run.
Not using finding a way to utilize Sam Williams more.
We could go on. But I'm an optimist. I look at what McCarthy is doing right, and I see more of that than what he's doing wrong. He's a good coach. I think we can all see that. He's even a pretty good coordinator, I'd say.
Look around the league, and no coach is perfect. Even the Great Bilichick fell off the radar.