We could have annihalated some of those non-conference foes, but when it comes down to conference play, that type of play would have been very inconsistant and would have never won any type of big things.
Just look at Johnny Orr. He was that type of coach. Not much defense and a very freelance offense. He turned around the program and created excitement, but did anyone really thing that was going to lead to conference championships and final 4's? They only way it could have is if you just have so much more talent than the other guy. Thats the only way you can win consistantly in that type of system.
ISU had its most 'big time' success under Tim and Larry. Both ran a highly structured offense and focused on defense. That led to much more success than our run and gun offenses of Johnny Orr and Wayne Morgan.
As for how long it takes to 'learn the system', it will vary from player to player. However, I think Gmac's history has shown that in the third year, the team will have the system learned. It may be delayed a bit here because of player attrition, but I don't think it will be that much. By next year, we will have a pretty large group of guys that know the system (Garrett, Petersen, Haluska, Johnson, Johnson, Thompson, Brackins). Having this group of guys will make it much easier for the new guys to learn the system. They will also be able to hide the mistakes of the new guys better.
This year the returning guys we have are Clark, Hubalek, Johnson, Johnson and Thompson as the returning guys. A few problems in there. First off, no guards to help the new guards. Thats probably the biggest problem. Second, Clark, Hubalek and Wesley have been hurt and missed a lot of practice. That hurts their ability to help the new guys learn. Thompson never got to run the system in a real game last year, so that limits his ability to help. That leaves Cory Johnson, who plays a position where there really isn't that much to help. Plus, his playing time was limited somewhat last year as well.