Rhoads staff was about 1 recruit away from completing the class, with a recruiting ranking of 92. Since Campbell has come in he has only kept a handful of those guys (most of which are the "no P5 offer" kids) and rebuilt the class back to the number Rhoads staff was at (15). His class ranking is now 69.
I hope I don't need to explain to you how big of an improvement that is. Additionally, Campbell has come in and not once made an excuse for what Iowa State isn't, and has only overly emphasized all the things that it IS. The exact opposite was true of Rhoads. All you ever heard Rhoads and staff talk about was, "Well ISU is hard, we can't get good kids, its cold here, blah blah blah." They were a bunch of losers and whiny crybabies. That trickled down to the players. If nothing else, that mentality being gone will help tremendously.