That's why I think we (perhaps OGR) should set up a registry, like the Bedbug Registry, that lists known "problem cases." To prevent libellous entries, the complainant should be required to post photos showing the degradation.
Some well-known cases are the JLC GG1 truck sideframes, Weaver troop sleeper floors, MTH P5a box cab body, prewar 700E and 763E frames and tenders, American Flyer O gauge lead and trailing truck wheels, pretty much anything made by Dorfan in the 1920s, and now Ben's Atlas 55-ton hoppers. Caveat Emptor!