I find the opposite. I think his jumper is total crap. You can't count on it at all, even with an almost perfect release. I keep him in the lineup most times just because he can finish around the rim and dunk when his shot is off, which is pretty often. A lot of people here seem to have the same experience with him.
In fact, I just let my opponents shoot jumpers with their Durants. They might make a couple but I know they will miss the majority.
It's sad how 2K completely messed up such a good player like Durant again.