MLF seemed like a good hire at the time, but he doesn't seem to build his supporting team well.
I think MLF has done a poor job at building his second supporting team, particularly on offense, given the fact most of the key cogs in his initial supporting team left for promotions elsewhere a couple seasons ago. The internal promotions of guys from their lower roles into OC and other position grouping coaches seems to have largely been duds. I think his biggest weakness as a head coach has more to do with poor team discipline and a lack of accountability, and that really shows out with young players.
MLF would have done himself a ton of favors by not botching the D Coordinator hire after Pettine was canned. Berry has been a failure despite almost all of GB's significant draft capital and free agent dollars dedicated towards it and it looks worse the longer he's around. That extended focus on improving defense is not the reason the offense is by far and away the league's lowest salaried side of the ball in the NFL after Adams and Rodgers have left.
That being said, I think if this season totally goes off the rails and there's no signs of development/improvement, both Gute and MLF should be shown the door despite the fact Gute has been decent at drafting, and when he's got cap space to play with he has done well in free agency. Keep in mind, this team finished 8-9 with a healthy Rodgers as a starter last season, so the roster talent was already in severe decline due to bloated veteran salary cap #s and being forced to go young wherever they could. Being into the 2nd year of that youth movement, some growing pains are par for the course but significant regression during the course of this season leads to blaming a mix of both poor coaching/development and questioning whether the right young players are even in the building to begin with. If it stays really bad the rest of this season, you've got to take a long look at both Gute and MLF because they're the ones responsible for both who's in the building and how they're being developed.