I use keyboard and mouse for most games, but for Skyrim a controller is a must for smoother gameplay and good character control. The game, like it or not, is a console port. If you want silky smooth gameplay @60fps, you almost HAVE to have a controller. Also, I have much more control over stealthy characters. With WASD movement you really only have three speeds, Extremely slow (with walk toggled), Normal Speed, and Sprint. With a controller, you can move around in stealth at any speed. It's great. Not to mention rumble and horse control.