Yeah, it's definately the user. Of course, I don't deny that there are good joysticks and bad joysticks, but in the end it was the user who broke it. They didn't "wear out" after one month. If they did, it was because you wore them out by handling them badly.
But I don't blame anyone. Everyone have their own way of playing, and while many people use the "more power, less subtlety" method, I prefer the more delicate handling. I never felt the urge to push the joystick harder to the left than it's supposed to go.