also (sorry I'm a huge ducks fan)
the Ducks offense is so differen't then the majority of the nations that the game can't effectivly emulate the play book
EA has a slot for a Full Back, The ducks don't have a Fullback position
the ducks have a ROV (Rover) on defense and play a 4-2-5 that's a 4-3 look. Basically it's 4 linemen, 2 linebackers, 3 cornerbacks, and free saftey that actualy run a defensive formation. Then the ROV watches the play and attacks what the offense does. ROV's are like defensive QB's, they have to watch the offense and know what formation their in, and what that means (when their in a big ace on 3rd and short they have TE dump off tendencies etc).
That's why the Ducks had the best Redzone Defense in the Pac-10 last year. It's a bit less vanilla then your normal SS, and the game just can't emulate it.