Pitino and Johnson had done literally nothing to suggest they should be Big Ten basketball coaches. Muschamp and Mullen were pick of the litter type hires. McElwain was pretty well regarded too. Off the top of my head I didn't think Napier was an impressive hire but I looked it up and he was 40-12 at Louisiana and finished 15th and 16th in the country his final two seasons.
I certainly think there are other problems at Minnesota, but it's also tough to judge when you are this overmatched in the coaching department for going on a dozen years now.