My friend, I agree 100%. I love the design of the 360 controller, but the quality is not that great. I've gone through a number of controllers in a year and a half. The analog sticks are always getting stuck in off-center positions, and the buttons become less responsive way too quick.
I'll be the first to admit that I give my controllers a workout, but no system's controllers have ever gone so fast on me. I've had my PS3 for almost a year long than my 360, and I'm only on my second controller. I've had, I think, three or four for the 360.