Sorry, I've got nearly 40 years of experience that says otherwise. But I will absolutely concede that this was with nothing more expensive (or higher performance) than a Maglite.
I get the feeling that all the "regular Joe cheapo" flashlights are somewhat "underclocked technology" that survives, while our "CPF grade flashlights" are somewhat "overclocked technology" that's prone to failure due to pushing ahead of it's time...
At risk of opening up a nasty can of worms here, this whole issue has been hashed out ad-nauseum over in the headlamps forum (although most of that thread was probably lost in the crash).
It is easy to perceive a particular brand as being/having low QC because in a place like this, we're much more knowledgeable and have higher standards than Joe Average Consumer.
The truth is that we are NOT a representative sample; meaning that the things we discuss here don't match what goes on in general for the rest of all people who buy a particular kind of light. The result is a highly skewed view of the particular light in question.
I could go into a long discussion about sampling, statistics, and all that (I teach statistics in fact), but I don't want to bore people or waste their time. The best thing I can say is that Marshal from GoingGear has commented on this issue, and he sells a LOT of ZL's, and has said that he sees a defect/return rate of only about 1 or 2 percent.
So, the odds are, that if you buy one you most likely won't have an issue with it. And, if you really want to be sure, order one from Marshal and ask him to vet the light in advance of having it shipped out to you. I'm pretty sure he's done that with other CPF'ers and it will mean you'll be assured of getting a good one.
But again, in short, it's a mistake to think that what we discuss here at CPF about ZL's (or any other brand of light for that matter) is a good representation of that brands overall quality.