If you're looking at his track record, the evidence doesn't point to a bad coach or even a mediocre coach. I don't care what league you compete in, winning championships is hard. You don't go undefeated by accident. He'll adapt and figure out how to get Nebraska straightened out. It's not an instantaneous thing. He's 0-4 right now though he could easily be or 3-2 with the Akron game. He's not, and that's fine. He's still the same coach with the same staff, and they'll be fine. Starting a true freshman QB game 1 out of the game is tough when you can't lean on your defense or offensive line.
When you have the worst offensive line in the B1G to work with (
https://www.profootballfocus.com/news/college-big-ten-ol-rankings-week-5) you can only do so much until you are able to turn the corner with recruiting guys who can play in your system.