Two things
1) I use computers everyday for at least 5hours a day. Im currently studying the increadably easy subject(for me anyway) of computer maintenence and repair. So dont question my abilites of using a computer or the understanding of one, as i could probably teach the dam course that im on with more accuracy than what im given.
2) As for the smoothness of looking left and right. Are you refering to the speed at which it switchs? On GTA3, when you looked left/right, you would slowly see your character moving his arm/gun to the relevent direction, in VC, it just goes strait to the right direction. Dunno why its like that, but its no biggy.
1) I am not questioning your abilities, just your knowledge of frame rates, motion and how the eye perceives it.
2) In the game stand still, now using the mouse pan left and right, notice the choppiness, do the same with frame limiter off you should notice a big difference.
another example is moving your mouse across the screen, start sweeping left to right slowly, nice and smooth yes. Now go quicker getting less smooth? same principal.
Another thing to try, change you monitor refresh rates to 60 hz - I would hope you see the flicker, now move up a stage say to 70hz do you see the flicker ? whatt about if you turn you head 45 degrees away and use your peripheral vision do you see it now?
Their is a big difference between playable and smooth, 30fps is playable but it is not smooth. In face paced games a higher fps is essential.