Last nite I decided to download and play the Quake4 demo for the x360. I think it was the really subpar framerate that made me motion sick. The last fps that made me that sick was Ken's Labrynth (wolf3d engine) for the 486. I felt so sick I had to lie down and I fell asleep. I can't belive how bad this port was. It seems like it would be a fun game if they had actually spent some time optimizing it. Who the heck dropped the ball on this one.