I used to slate the console pads for FPS games and defend the KB+M combo to the hilt, but after having a 360 for a while now and a few FPS games it's not that bad at all really.
The first FPS I tried with a pad since Goldeneye on N64 was Rainbow Six Vegas, at first I was like "sod this" after shooting the floors and the walls more than anything else, but after a while I got used to it again and I'm now totally addicted to COD4. Stats for COD4 are roughly 15k kills for 5k deaths, so I must be doing something right
If only they would bring out a KB+M for the 360 mmmmmm