Webdemon, I am afraid you are way off about the brain interprets frames per second. It's far more complex than you think. Check this out:http://www.joz3d.net/html/fps.html
There is plenty of other articles out there that explain the same thing. Frames per second in gaming is not ANYTHING like FPS in movies, TV etc.
I find 30 fps in gaming to be on the border-line of playable. Usually because if you are getting 30 fps, you are going to get into a high action scene and it will drop below 30, causing noticable choppyness. 60 fps is much better since in a high action scene it'll drop to say 40 or so and still be fine.
Everyone has their own opinion. I say the more FPS you have, the more fluid the gameplay, and the better experience you are going to have overall.