I heard a saying many years ago regarding one of the biggest, most recognized brands of scuba regulators (Scubapro):
"Divers are divided into to two camps: One swears by them. The other swears at them". (For the record, I really like Scubapro regs, and have for years).
I think this sentiment or diversity of opinion can probably apply to almost any brand, any product, not just scuba equipment.
If you look hard enough, you'll find people unhappy with a certain brand or product.
When you don't have to look hard to find unhappy customers, then there may truly be an issue with quality.
I own or have owned Aqualung, Mares, Zeagle, Scubapro and now HOG regulators, and have rented or borrowed other brands.
I rate the HOG products that I use as at least the equal of (if not superior to in some cases) the "Big Players" in the industry. When you couple the quality with the low cost of entry, it is hard to beat HOG. There have been problems, and probably will be problems in the future, but honestly the same can be said for most brands.
Best wishes.