I have to disagree with you there. 3D is natural, because our world is 3D, but I agree that the tv 3D isn't natural. However, when one focuses on one point, that is the only point that can be seen clearly. One may remember the sharpness and think everything is clear, but in reality it isn't. Our eyes are so specific that we have to shift from one dot to the other in a colon in order to see each clearly. If anyone wants a detailed explanation, get 'relearning to see: improve your eyesight naturally' by Thomas r quackenbush. It explains a lot about eye focus and shifting.
I personay like 3D, but I can't diffuse(try and see everything clearly at once) otherwise I do get a headache, but when I centralize and shift(only see one small point clearly at a time, and constantly change points) it's amazing, and it's an absolute wonder to watch a movie in 3D, which is why I'm really excited for VotDT in 3D.