You're right it's not that easy to play with Keyboard/Mouse than to play with a xbox320 pad. But if there is the possibility to change the button mapping, the Keyboard/Mouse Player will have more control-power than the pad Player. The difference is not that big like in Shooters, but the result is the same. You can point much faster & more accurate with a Mouse. It even allows you in some Games to use strategies you coult never do with a pad.
But I love pads too in some cases like on snes Games like Terranigma, Super Metroid etc... ;-).