He mentions the awful truth of these peripherals as far as game programming is concerned.
From Shawn's posts: "... Gamepads, like keyboards, are not perfect. They are designed to be cheap, sturdy, and nice to hold: accuracy comes second ...".
You can find the installments here:
The posts give useful advice on how to deal with keyboards and gamepads as well as explains how XNA makes our lives easier for reading thumbsticks' absolute positions.Enjoy!