I haven't found this to be true. I played a little more on Heisman last night and practiced for awhile with it. I find that the QBs on Heisman are almost as dumb as AA. I've got human def. awareness at 0, knockdowns at 0 and INTs at 0 and in four "half" games have picked off the cpu at least once every time. I've picked off Ainge of Tennessee twice in one half and the OSU QB twice in one half with Michigan's defense which isn't super tough. They still make dumb decisions.
My skills are clearly suited for AA and not Heisman. The only reason I've screwed around a little bit on Heisman was to see if the CPU QBs are better and I honestly don't see a significant improvement. The things that jump out at me are the line play. Sliders for the most part can bring more balance but the cpu pass blocking is insanely good on Heisman. Even with human break block at 100 and cpu pass block at 0 the QB seems to have all day against a 4 man rush (and still makes bad decisions).
I also noticed that their WRs rarely drop a pass, even with WR catch at 0 and in traffic. The CPU DBs are also better on the Heisman level and are too good imo. Elite WRs should be able to beat average CBs more often and even with cpu def. awareness at zero I struggled throwing deep to Manningham. With single man-to-man coverage deep and no safety help I only completed one deep ball in 10 attempts. The CB was just an average player and yet was breathing down his neck on every single play knocking down a number of balls. The deep ball is fairly dead in this game on AA as well but I can still complete it more often than on Heisman which seemed like an excercise in futility. If I can only complete a deep ball 10% of the time when I have a mismatch then its almost pointless to even try it. In real life if Manningham had single coverage against an average CB, he should either draw a penalty or catch a pass close to 50% of the time imo.
I do think Heisman is playable though (I used heavy slider tweaks in my favour on offense). In a rematch of another half game with Cal against Tennessee I was tied at 10 going into the half. I didn't notice the CPU jumping the snap a ridiculous amount of times (unlike the PS2 version last year on Heisman) and I can see how the better players like playing on Heisman. The running game on both sides seems good. However, the only reason for me to attempt to play at this level was to see better cpu QB play and I just don't see a significant improvement at all. I will just stick with AA and deal with the occasional 3-5 pick game I get from the cpu.