Pollard has done very good things at ISU as far as facilities and finances. IMO, it's silly to try and minimize his accomplishments in those areas (yet some on here continue to try).
I think the big issue regarding his decision making was giving the Rhoads contract extension. Whether or not it seemed good at the time (and there were a few who questioned it originally, based on the fact that Rhoads really only had one winning season at ISU, and given the flame-out after the OkSU upset), it seems like a bad decision now.
For me, the big issue is whether lessons are learned from mistakes. I think that not just the AD, but the ISU community as a whole, needs a change of mindset. We need to stop worrying about being a "stepping stone" , and just get the best coach available for the money we can pay. Hoiberg should have shown us that if someone has bigger aspirations, they are going move on, hometown boy or not.
There is a thread going on about Utah football. Urban Meyer used Utah as a stepping stone to Florida. The next guy stuck around and the program has done well since. Dennis Franchione used TCU as a stepping stone to Alabama. The next coach at TCU stuck around, and their program has done as well.
You can't control the decisions that a person will make in the future. Get the guy who can do the most good for you. Benefit and grow from his knowledge and abilities. Make reasonable attempts to keep him around with compensation. If he is successful and raises up your program, but decides to move on, where is the harm in that? There is no reason that the stepping stone can't become the destination.