The word "bad" is in quotes because you'd need to define "bad".

If you expect the plug to heat to a tip temperature that is nearly white, the plugs would be characterized as "bad". Roy would toss these plugs out because they don't generate the necessary tip temperature necessary to start at -40C.

Prior to testing them, the increased resistance told you that they wouldn't perform like a new plug and your testing confirmed it. Increased internal resistance translates into lower current and that translates to a lower tip temperature.

Said plugs would be fine for most folks down to an estimated 10F. or so, depending on engine condition, of course.