I don't doubt that's true to an extent, but then what's the explaination for Fight Night Round 3 and NHL 2k7 on 360? The FN3 producers essentially admitted that they put that game out in 2006 with practically the last-gen engine and an HD "sheen" over it. And if you played NHL 2k7 for 360, there was little or no difference to the way that game played on PS2 vs. 360.
I played both NCAA 2005 and NCAA 06 yesterday. The visuals did not translate well to an HDTV (not surprisingly). But I think people have also failed to realize how much our gameplay standards have gone up over the past 4 years. Take any elite receiver in NCAA 06 (I used Braylon Edwards), and you basically can use a long bomb as a "win" play anytime you want. Throw it beyond the safety coverage, and your guy will run it down, almost guaranteed. Last-gen Madden was arguably even worse in that regard.
I think that the emergence of online play really changed the way people felt about using cheeser plays against the CPU. If you never played anybody but the computer, it was really easy to convince yourself you were "outsmarting" the computer by pressing the Square button and hitting your flanker in stride over and over again. That is, until you went online and had somebody do the same thing to you over and over again, plus 10 other "money" plays you never thought of. Once people "saw through the veil" and recognized how easy it was to break those games, the gameplay standards went way up. (We also demanded stuff like gang tackling, etc., but that's a separate point).
But I will say that the off-the-field stuff in NCAA 06 and Madden 05/06 is still probably superior to what we have now. I'm considering playing NCAA just to sim the games and assemble my roster, kinda like an NCAA Head Coach. 70% of my enjoyment of that game was doing the recruiting stuff anyway! NCAA was starting to make headway into becoming a deeper dynasty mode (the phone call system has been pretty popular, and we now have online dynasty and competitive recruiting, plus promises), but they took away the discipline system. Worst of all, they completely broke the progression system, which takes away any feeling of accomplishment I get from assembling a good team.