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Another article thst helps to explain the experience:
http://www.motorauthority.com/news/1081363_electric-power-steering-we-ask-an-insider-where-its-headed
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In the initial days, it was a very rudimentary system. Somebody nailed together the parts and came up with some control strategies that seemed to work—left was left, right was right—and you could adjust the assist level. But nobody really put a lot of thought into the idea of what are you missing from a hydraulic system, that you need in order to make it feel more natural. And to be honest, I think some vehicles today are lacking some of that in their systems. It all comes down to being able to generate or transmit a feel in the steering wheel that fits your mental perception of what the vehicle is doing.
So specifically, a lot of times what you'll see is that you have systems that lack damping. You turn into the corner and it feels okay turning in, but coming out, it just wants to fall back to center, and your natural motion is that you turn in, you have a certain effort progression, it needs to be a linear progression of effort and response. Today what happens with those ‘bad’ systems is that you go up on a good torque curve, and coming back you either have too much or too little damping. Some of the worst systems require a good amount of force going into the corner, then the torque just falls away and the steering gear just wants to slam back to center. Subjectively, you want to feel like you go right up an effort curve and then back down the same curve—it needs to feel the same loading and unloading. Anything else is unnatural."
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