I play majority of my PC games on 55" panny TV from a couch, so x360 controller is practically only option. I am playing 99% games with it these days. Right now I am playing Crysis 2 from humble bundle. Played Metro Last Light before that. Will play Crysis 3 and Aliens Colonial Marines after, also with x360pad.
Controller has much worse accuracy (so I use aim help), but triggers,feedback and analog movement are good advantages compared to mouse and keyboard.