I feel like IQ is one of the most important factors if you're wanting to win titles. As in.... deep in tournament runs, when it gets down to the E8 and beyond, and you're playing the best of the best, IQ is extremely important. You're not gonna win those games if you have low IQs, because the teams you will be playing will likely have really high IQs. I feel it helps with crunch time situations.
People say that the difference between intense recruiting battles can sometimes come down to the difference in AP because all other efforts are equal. Well I feel like in game play, that's what IQ represents. When stacked teams play against stacked teams, IQ, the intelligence in which the team manages the offense and defense, can be the deciding factor