I think the issue is not with QB accuracy, but with traits and how they affect the players. For example, Brady appeared to be missing passes by a lot in the first vid. However, his traits have him at Forces Passes 'Ideal' and Throw Ball Away 'Yes'. So I think the issue is that the AI sees that there is no one open and since he doesn't want to force a pass, Brady's traits have him throwing the ball away to the sidelines.
Another example would be Vick and his Tuck and Run trait set at Often. From watching the first vid again, there was a time where Vick was off and running 3 or 4 plays in a row, and overall scrambled a bit too much for my liking considering the game was played on 3 minute quarters. The the most rushing attempts Vick had last year was 11, but of course this could just be an outlier with the game being in the snow(maybe conditions having an affect on decision making?).
Not saying that these are issues as of yet, since I do not have the game and I'm just going off these videos which fatleg so generously posted. I do think that these traits are worth looking at though, since they are a new feature for this year and some tuning might need to be in order should more people find some annoyances like what I described above.