[The Fifth Horseman]

So what you are saying is that I need to purchase and Analog Joystick? I wouldn't be able to configure the joystick on the 360 gamepad to function as a 'joystick?'

No, not at all. There is no specific requirement to use an analog joystick.
What Japofran meant was that some games work better with analog rather than digital controllers, since the analog controllers allow for more fluid movement control.
You can read more about the difference between analog and digital joysticks on Wikipedia.