Hacket's play calling wasn't horrible but it wasn't great either. His tendency to always run on first down is an issue.
1st down is the easiest down to pass on because you, literally, have your entire playbook at your disposal. Consistently running on it makes it more difficult to run the ball AND puts your QB in a position to always have to throw on 3rd down , which is the most difficult down to throw on if there are more than 4 yards to go. So his tendency is making it more difficult on the run game and more difficult on the passing game.
He needs to mix it up more. I am fully behind a run offense and the pass/run ratio isn't a problem. It's his predictability that's going to be a problem.