Keyboard vs. gamepad

[Lemonray]

PCs have a great and obvious advantage in the form of the mouse. Gamepads, however, allow for more precise movement of the character due to analog control. PC gamers have the best of both worlds because they can use gamepads anyway, along with the mouse if they want. I once played TF2 using a 360 controller for movement and a mouse for aiming, and I found the superior movement offered by the controller rather helpful in the game.
I'm considering getting myself a flight stick for the purpose of further control experimentation.

Edit: As for lightguns and similar things like the Wiimote/PSmove, I've found that they're also inferior to mice. Not only are they generally not quite as accurate as mice (This depends on the hardware) but since it's impossible for any human person to keep their arm -perfectly- steady without being dead, lightguns and similar tools will always fall behind mice because players are required to support the device themselves.

I simply do not care for the FPS genre anymore

And this matters because...?