FPS with controller?

I recently purchased a controller for my PC thinking it would make gaming easier. It's a Logitech similar to a PS3 controller. If you try to use a controller in FPS games you're gonna get PWNED! You can't aim anywhere near as good as you can with a mouse. The controller is good for a lot of other games, though, like World Golf Tour (the hottest new browser based golf game) because you can sit back and relax, you're not stuck sitting up over a keyboard and mouse. If you use a controller, I recommend the "Xpadder" software. It's a tiny program and lets you map the mouse and keys to the controller. The software that came with the controller for mapping was confusing garbage. You can get Xpadder for free on many freeware sites but just be careful which site you use, as all freeware sites have "download" buttons everywhere and most are just advertisements.