Most people are extremely wrong about "eyes not used to 3D yada yada".
Here is the skinny on why some people get nauseous while others don't. Each eyeball acts like a camera sending a single 2D picture to your brain, inside your brain it puts the two pictures together and thus you have depth perception. Games and movies are trying to replicate this feature by sending two different images one to each eye, and it works, you indeed get depth perception. Only one problem, the depth perception your getting is based on what the developer produced not what your brain is producing. Each person's eyeballs are set a different distance apart at different depths relative to your nose / eye sockets. You don't notice it but your brain use's your nose as a reference point when lining up your eyeballs, close one eye then the other, in both instances you can clearly see the side of your nose at the center facing edge of your vision, open both eyes and the nose vanishes (but is still present in the pictures being sent to your brain). Without that nose your brain finds it difficult to line up your eyeballs to focus on any single object. Compound this with the fact that any artificial "3D" production will have different depth / separation then what your brain has spent its entire life using and now you can understand where the discomfort is coming from.
Some people's brains can adapt to changing alignment / eye separation easier then others, while other people's brains would be completely incapable of properly working with a different set of eyes. This is also why it "takes getting used to" to use 3D, its the process of training your brain to work with different depths, separations and the lack of a central fixed reference point.
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