You people realize that someone whos experienced with a controller will perform as well on a console as someone whos experienced with a keyboard on PC. There's very little difference.
The ShadowRun guys didn't seem to think so. Regardless of the game's overall quality, they hindered PC players while giving console players an impractical amount of assists. Both kinds of players seemed evenly matched, but from what I remember the PC players felt so hindered they didn't bother playing for too long.
Also see Quake III: Arena on the Dreamcast, where people who plugged in a keyboard could easily overwhelm players using a controller.
As for the general schism in difficulty between PC and Console games, I think it's a matter of control differences. I've played a few games on both console and PC (RE5, Hydrophobia, Left 4 Dead, etc) and haven't noticed anything significant. Though I remember the original Crysis, a PC exclusive, being much harder than Crysis 2, a game designed with both audiences in mind.