Well subs are always going to be bad in Live 10, they don't have any real rotation setup. Afflalo played a bunch in my game but there was alot of Carter at the 1 and Chauncey/JR/Arron at the 2. Lawson didn't come in until garbage time.
The steal button might've just been placebo. I just had the best feeling steal early in the game but i (not my teammates but the player i was controlling) wasn't able to have much success deflecting/intercepting passes so i'd say its the same.