On the PC I use a 360 controller for third person games because it feels right. I prefer the mouse for FPS because, to use an IO-stream analogy, it's "random access" as opposed to the "sequential access" of an analogue stick. That is, if I want to look 90 degrees to the right, I just move my mouse to the right by whatever the corresponding distance is in a fraction of a second. With an analogue stick I have to push it to the right and hold it there for a second or two until my crosshair arrives where I want it to be. If I make it any more sensitive than that then precision aiming becomes impossible. Having said that, I was perfectly happy playing Deus Ex 2 and Battlefronts on the XBox.