He wouldn't be my first choice to be the next HC of the Cowboys, but to say he was never good - ever?...
Mike Zimmer
Named Vikings Head Coach on Jan. 15, 2014...Coached 134 total games (including five postseason contests), going 72-56-1 in regular seasons and 2-3 in postseason contests.
Led Vikings to 13-3 mark in 2017, advancing the team to the NFC Championship Game.
Earned 2015 and 2017 NFC North titles.
The Vikings ranked No. 1 in the NFL in total defense in 2017.
Served as a defensive coordinator for Cincinnati (2008-13), Atlanta (2007) and Dallas (2000-06) prior to his hire.
Coached Cowboys DBs when Dallas won Super Bowl XXX over Pittsburgh.
Had a top-7 defense in four of his final five seasons with Cincinnati.
Numbers above look pretty solid.