Let's look at who he's had to replace in the only sports that matter:
Football: replaced Mac, and while many people disagree here with that it was time. I'll stand by that forever. Hired Chiz, who despite a lack of success went to Auburn which you really can't blame Pollard for. Hired Rhoads who ultimately failed but was a good fit for the program at the time. Hired Campbell who if we are honest will likely leave again shortly. That's just the nature of the beast at a school like ISU. Functionally he's fired one guy who very few ISU fans disagreed with, and had to fire another guy who overall did pretty well at ISU.
Basketball: Fired Morgan, which was pretty much a forgone conclusion for any AD hired. Hired McD, which a lot of people were very excited about, but that was an unmitigated disaster. Hired Hoiberg and Prohm, who I have zero complaints with either.
Wrestling: Cratered, but really made one bad hire, in a sport where ISU's average home dual attendance is around 3,200 per home meet. That's the 6th best in the sport, and roughly 1/3 the amount of people that go see ISU women's basketball. It's a niche sport and should be treated as such. Plus, you're acting like ISU fans have given a crap about wrestling in the past. The '07 season where ISU finished second they averaged 2,330 fans, 1,000 less than they averaged this year. They averaged less than 2,000 several times at the start of the 2000s when we were actually... good.
Every other sport is in a lot better shape under him.