In reality, some of the companies got their bad name years ago but currently produce useable rifles. I received one of "black list" AR uppers as a gift from my family several years ago. The family had no idea the company was supposedly making POS rifles/uppers but being on a budget, they bought in good faith.
That upper using the crappiest junk ammo will make a surprisingly good showing and fed good ammo will rival most any AR on the market at a reasonable price. When the upper was ordered and the reason for the purchase stated, (wife of the company's owner took the order) the owner handbuilt the upper himself to HIS standards-not his employees' standards.
Now, I wouldn't part with that upper regardless of performance but have no reason to fault it for any reason. Most shooters wouldn't accept one of this brand as a gift let alone buy one but I can't complain about mine.
Oddly enough, someone must be buying this brand or they would have gone out of business several years ago.