Let me put this out there, not as a defense of moots specifically but as a general observation by someone who'd prefer to invest in a really nice item and enjoy it for years. My Moots is about 4 years old. I just sold a 12 year old Serotta Ti.
Without hearing Moots' side of the story it's hard to know what is true and what is just one or two people sharing their isolated disappointment. The internet is super-efficient at spreading stories of dissatisfaction. Years, ago Moots used to participate in this forum, if I remember correctly. Shame they aren't part of the discussion now.
Is it possible their staff changed and the work is not as consistent? Yes. Is it possible one or two frames slipped through QC? Also probably "yes." There is no perfect manufacturing industry. I've yet to own a perfect anything assembled by a man, and that includes cars, bikes, furniture,motorcycles. I'm writing this as someone who sees a fingerprint on a paint job and worries that it's underneath the clear coat finish!
It's also possible they made mistakes and corrected them, as mentioned by the previous poster. If that's the case, then I think they (or any manufacturer) should not be punished. It's the frequency of mistakes that should be of concern, and we have no way of knowing that with any sort of accuracy. I bet you they track how many frames they have to "rebuild" and it would be nice to know that (from any manufacturer for that matter), but I doubt anyone would share that data.
Just something to keep in mind. I'm thinking about moving to disc brakes on a road frame and Moots is under consideration. I haven't seen anything that would change my mind, any more than hearing that some people don't like their IPad would change my mind about buying one of those.