Remember when FPS on the PC didn't use the mouse at all? i.e. Doom, Duke Nukem, Quake.. Even Quake 2 when i first started playing I strictly used the keyboard.. My controls were: arrows to rotate and move forward/backward, A & Z to look up and down, Space was jump, Shift was walk/run, CTRL was fire, and ALT was the my strafe modifier. I was perfectly content with it, but mostly because I had autoaim.. Quake 2 did not have any autoaim in multiplayer, so I had to learn to use the mouse to get some accurate shots, especially with the railgun.
I think that's why I won't play console FPS games, especially not in multiplayer. The need to be pinpoint accurate is there, but they lack the tools. I can feel all that inferiority and I won't allow myself to regress since I've already developed the skill to use a mouse to aim.