Our individual thresholds for quality differ, that's for sure, because my definition is "Was the object built well, considering it's constraints?" As an example,if something is made of plastic (or "polycarbonate"[1]), I expect it to flex to a degree, and it can still be very well made (e.g. old school Nokia phones had incredible build quality and industrial design)

1. I hate that plastic had to be re-branded in this manner because a small-but-vocal contingent decided it "feels cheap" on phones, or somehow lowers build-quality. This resulted in glass-backed phones which ironically had to be kept in plastic cases to take advantage of plastic's superior elasticity.