Payton had multiple 7-9 seasons with prime Brees and shoulda moved on faster. But yeah Harbaugh and Tomlin might look different if Dak was their worst starting QB.McCarthy is the only coach on that list to have a Franchise QB, in his prime, on his roster every year. So by that measure he has underperformed.
Tomlin and Harbaugh have shown that they can win, even with some garbage QB's. Not sure McCarthy can say the same.