Television often looks smooth because it is has a consistant framerate. Someone earlier said Halo looks smooth on the 30fps setting, because it is stuck on 30, and doesn't change. If you turn v-sync on on Halo, the framerate will fluctuate a little between 60 and 70 (depending on your refresh rate). This actually makes it seem a bit choppy.
"the human eye can only process 60 fps" I've heard similar to this, yet i could tell the difference between 60 and 70 fps, unless of course it was going below 60.