I used to swear by MS mice. The IntelliMouse Explorer, et al. Always got a good few years out of them. My latest MS mouse was not that well designed, and failed in a completely predictable matter about 12 months after purchase. It was plasticy and fragile. Very fragile. Were it not that I stripped it down and rebuilt it, it would actually have failed within about 7 months, when it originally stopped working. The final failure could not be repaired, however.I'd say a lot of peripherals these days are poor quality, plasticky, designed to fail.
Anything from keyboards and mice, to headsets, and monitors.
I don't really think there's anything that makes Corsair particularly worse than anyone else.
If anyone's looking for a keyboard and mouse, the pair I'm using at the moment seem pretty bulletproof.
KB: Qpad MK-50
M: Logitech G302
This wasn't a cheap mouse. They sell for £55 ish.
I think companies want us to view peripherals as consumables; disposable. Even if they cost £50-£100...