Maybe this is an unpopular take from me, but I actually don't dislike AudioGD's sound quality at all. I doubt even half the readers on the internet have actually spent anytime with those products. Low SINAD does not always equate significantly worse sound quality.
What I dislike about AudioGD though, is that they sort of take advantage on the less-informed passionate audiophiles (I was one of them) with false marketing, mumbo jumbo voodoo audiophile buzzwords, and false measurements that thanks god Amir and others had some good chance to reveal.
They did not even approach the market with something like "we're all about analog and oldschool sound", they advertise themselves as true bringers of fidelity. Besides that I've also read numeral safety issues about their products, maybe its easy for seasoned DIY-ers to fix those issues on the spot, but for typical consumers that are not so knowledgeable, it's dead weight.