I would argue that what you're seeing with bad design is not the fault of UX design as a concept but rather specific examples where it failed. UX designers are supposed to help ensure that software is usable and frustration free. If the software fails to achieve those things, then either the UX designer has failed or has been overridden by someone else. Or it's consensus design. The UX designers job us not to make things prettier or more sexy than usable, because sacrificing usability with frustrate people, which is something they should understand and apply.
