great players work on their weakness'.
Agreed, they just need to add variety on their moves to be unpredictable sometimes. But some weakness can't be worked on like Free throws, if Shaq improved his free throws he could have add a couple of championship rings to his fingers.
He can't be perfect and no player is perfect, usually big guy which are athletic at the same time are not good in FT.
I believe Shaq was also the heaviest big man in the NBA history ( correct me if I'm wrong), so that's expected, what's good for him is he won a championship.