Well, I can cite the too-tight nut slots on my 2018 Gibson LP Classic, along with the fact that they now seem to be using pots with 18 spline shafts but fitting their standard knobs designed for 24-spline shafts, so they don't fit properly.
My mate Max had such a poor new Ibanez with so many faults (e.g. overly-rolled fretboard/fret edges where the E strings were on the angled part of the fret making it unplayable and big neck pocket gaps) that he sent it back and then complained loudly to a mate of his who's the Ibanez UK sales manager. This tied in with the sale's chaps thoughts of general poor quality control from the factory, so Max got invited to the UK headquarters for a weekend to review three other guitars pulled at random from stock and he rejected all of them. That was a few months ago so hopefully (as there was a manager over from Japan there) their quality should be improving. He did get given a £2k guitar for doing it (which luckily had only minor set-up issues that Max would have corrected anyway regardless).