If you use a 360 controller (Native support, perfect compatibility) it's pretty much just like the console. I play the game with it perfectly fine, and after you get efficient with the grapple everything is smooth.
There's a bit of negative acceleration and sensitivity issues with KB+M, but to me it's still very usable. Just takes a bit of getting used to, but you're going to have that no matter what control scheme or platform you use.
PC: http://i305.photobucket.com/albums/nn233/cody4783/cody4783.jpg Currently waiting for: Split/Second - PC
"i can't imagine the 360 improving the controls over the pc, they work fine for what they are.
it's mostly just hard to hit stuff accurately with the grapple when you're moving quickly.."
......the controls are horrible. I don't know how you can play this game longer than five minutes without a Xbox 360 controller. Cuz i sure as hell can't, oh, and the controller fixes that problem while trying to grapple something while moving. Instead of limited space with the mouse you can hold the joystick in one direction indefinitely. But, to each his own i guess.