David Cat said:
Secondly, mouse control is admittedly faster, but that just causes CONSTANT overaiming. Also, the mouse-wheel-weapon-switching idea just makes selecting the weapon you want very tricky. The wheel scrolls through weapons ridiculously fast. But the real shittiness of mouse control comes with its association with the keyboard. The keyboard simply makes movement an overcomplication; why use four keys when one thumbstick is so much easier?
You clearly have little experience with a mouse control. Since mouses generally feature a higher DPI and higher area of possible movement, it allows for a higher allowable margin of error. If you accidentally move your mouse a tenth of an inch to the left, no big deal. If you accidentally move your analog stick a tenth of an inch to the left, then it will become a big deal.
It is because of this reason that analog is actually MORE easy to overaim or underaim in most cases.
Secondly, most PC FPS use the numbers for weapon switching. Meaning, I can have 3-4 weapons and assign a single button to each one. You can't do that on a controller because usually you don't have enough buttons. PC FPS usually have a dedicated button (usually 'q' when you are using WASD) that switches between your current and previous weapon. I can really only think of one game where I would use my mouse wheel for weapons and that's UT.
I will agree with you that WASD is not quite as good as an analog stick. However, movement in FPS is generally insignificant in comparison to aiming. Besides, the eight directions you get from WASD is good enough along with the change in movement you get by changing your aim. Just take a look at this video from UT2k4.
http://www.youtube.com/watch?v=TPeKaal9lFg