[freehunter]

Well, I can give an example of a genre that is console- and mobile-only: rolling ball games. The k+m layout is great for FPS games, but sensitive analog input isn't something it's great at. Analog sticks and accelerometers are much better. I'm talking Super Monkey Ball or Katamari Damacy.

Another genre many people shy away from on PC unless they're hardcore and money-rich: racing simulators. A controller, a wheel, or an accelerometer is a much more realistic input method for controlling both a steering wheel and feathering a throttle/brake.

Obviously both of those genres exist on PC, but they're quite a small marketshare of an already small marketshare.