If you're used to PC gaming, and are just awful with a controller, I'd recommend the IOGEAR Keymander Controller Emulator. I've used it myself and it's not exactly as smooth as the controller, but it's a lot easier to use then a controller for any hardcore PC gamer. It's also cool to play console exclusives that you'd think you'd never be able to use a keyboard and mouse with, like The Last of Us.