I can say that the shooting in the retail version "feels" far and above anything else. I can shoot with Ben McLemore's sweet form, and it feels totally different than Rudy Gay or Derrick Williams by far. Different release points, different quickness. I feel like I have to hold the button until in real life I'd "flick my wrist" to launch. I don't know if that makes sense, but I really like the way it feels.
The free throws, I have seen 2-3 different ones I believe, but they all generally feel the same. And I could be totally wrong, they may be all the same. I know Shawn Marion has his separate one. The Free Throws do feel generic no doubt.
The dunks, I'm actually enjoying quite a few of them. I'm seeing more and more different dunks each day. They flow pretty smooth as well, no more "rocket dunks" that I've seen. That was one of my biggest gripes even in the teaser trailer, was Derrick Rose's rocket dunk. They all feel smooth/fluid, no real hitch.
There is 1 alley oop that I'm not terribly fond of, and it's the one that they catch the ball and **** it back with two hands before slamming it home. It looks ferocious, but it's the one dunk that does feel sped up to hid a transitional animation. When you go into replay though, it looks just as smooth as anything else.
Hope this helps somewhat.