WASD movement is pretty easily replaced by a controller, it's true: when it comes to aim, though, there's nothing that can beat a mouse.
Saying that, I've never tried a console shooter since Halo 2 back on Xbox. If you can convince me that it's playable, I might pick a next-gen up and give it a try.
I have an Xbox for that, but I'm such a n00b at Xbox hacking. I know nothing about it, unlike the PS3. Can it be softmodded or only hardmodded/mod chipped?