I don't even think that Campbell was a bad hire or 'worse' than those other hires. Those hires are just in different phases.
The longer I watch programs over time, the more I just recognize that for the vast majority of coaches, even at places with far more resources than ISU you have some pretty recognizable trends. You have an upward phase where they're selling hope, they hope to have success and that success builds on itself, and then eventually that plateaus, and then eventually there's a downward phase for 90% of coaches that few recover from. Then you roll the dice again on someone else. Maybe that roll works out, if not you roll the dice again in 4-5 years. You hope to have better odds on those dice with a 'good' hire, but there are plenty of examples of 'great hires' not working out and conversely of lesser hyped names overperforming.
I've wondered if part of the problem for ISU is that it has waited too long to re-roll in the past, making us bottom out at some dreadful levels, rather than recognizing the trendline and making a move, making it that much harder for our following hires.