Popped Madden 09 in today and yes, that game does the very same thing in terms of defensive AI playcalling/scheme. So this isn't something that is a "new" problem. I think it's exacerbated by the fact that player ratings matter more now than before. So whereas before a LB could maybe keep pace with the slot man, in Madden 10 they get destroyed.
So we have an old issue that is made worse due to the Madden dev team making the game better.
How's that for irony.