For me it's the opposite. When I built my new computer Halflife2 ran so smooth it gave me vertigo. I had to turn the graphics options all the way up so the frame rate would come down and then I didn't get sick. Most games don't do this to me, I think it has to do with the field of view being zoomed in more than most games?
I get the same thing... sick to my stomach in many fast FPS, especially indoors. Outdoor large environments (CoD3) are fine.