Mould King and Cada do not have the same consistency of fit that LEGO does
that's simply not true. i have mould king bricks that are indistinguishable in quality from lego. and many other brands as well. i have been buying other brands in china and i haven't seen a difference in quality for about a decade or so. the last issue i remember reading about was that some factory produced bricks with varying tolerances depending on the season, because the factories were not climate controlled. and that story is already several years old.
so yes, you could have an old set from a bad charge. but the times where lego was guaranteed to be better are gone.
that's simply not true. i have mould king bricks that are indistinguishable in quality from lego. and many other brands as well. i have been buying other brands in china and i haven't seen a difference in quality for about a decade or so. the last issue i remember reading about was that some factory produced bricks with varying tolerances depending on the season, because the factories were not climate controlled. and that story is already several years old.
so yes, you could have an old set from a bad charge. but the times where lego was guaranteed to be better are gone.