6 inch "King Kong" will not scare a child, much less an adult.
When it comes to 3D, human brain cannot be fulled.
Even a retarded brain correctly estimates size of objects all the time unless one of the eyes is damaged.
Screen parallax optimized 3D content always projects miniaturized and all depth is limited to a small box around the TV screen.
Realistic 3D is what can be adopted if such is promoted but at the moment there is not a single 3D title with realistic 3D content.
So, I agree that 3D at the moment is a "flop".