I think it looks kind of normal for a lower end LED meaning that there is no local dimming in those models that would help with that. I do not think you will get that much better unless you move up in models that adds some dimming features. The best thing to do is lower the back light as low as you can go. The backlight level does not effect the actual picture quality and should not be confused with the brightness level that does.
At night I have my eco sensor on my Samsung set to 2 out of 20. There is no reason to go brighter then that in a totally dark room. It will also help with backlight issues and eye fatigue and strain.