I think that having full control of everything is great, but there is no reason for guys like Shaq being able to shoot 17 foot jump shots. Hopefully, they will account for everyones shooting tendencies and accuracy. I'm almost sold this year. I skipped last year, but bought NBA Live 09.
One big problem I see already is Lebron stopping on dime and taking off like a rocket. Hopefully, this will be a mix of mocap and physics, not locomotion. We should be able to speed up variably by moving the left stick in a forward left/right direction.