My frustration with Gus is his reluctance or failure to learn from his mistakes from season to season. People, teams, organizations, etc, go from good to great by making small incremental improvements over time. You can clearly look at Saban's approach and see this. Saban not only goes by a set defined process, the purpose of the process is to learn and continuously improve what they are doing.
The offense usually makes some improvement as the season goes along, but I don't see any reason why the beginning of every season seems to feel like the first time he has put a team together. StatTiger points out continuously areas for improvement; for example, opportunities over the middle that are there and would open up other things, utilizing tight ends more, etc. We almost never see what are obvious areas for improvement implemented. We see game to game, quarter to quarter, this blind-eye stubbornness to running his base offensive plays and schemes no matter what. In some instances he has the talent, execution, and alignment on the defensive side that allows this to work spectacularly. In a lot of cases, just one of these things falls apart and our offense comes to a screeching halt; and he doesn't seem smart enough to quickly adjust his in-game play calling, or between game planning, or even in between seasons adjusting to his current talent.