Blizzard,
The accelerated patch release cadence since DF remains appreciated.
But NOT at the expense of product quality released to your customers.
The 20th anniversary patch has so many bugs, and serious bugs to boot, that it seems that Nerubians invaded your production pipeline successfully and laid eggs in the code. Celebrating the 20th anniversary of WoW with plethora of game-breaking bugs is humiliating for you.
Having said bugs interfere with my enjoyment as a customer makes me question whether it is worth investing time and money to engage with your product.
It is CLEAR that your production process is deeply flawed - I assume that you manage to destroy the vast majority of bugs before shipping an update, but the amount that goes through is unacceptable - improve your QA.
Prioritize gameplay and balance affecting bugs since they are most annoying to your playerbase - and I think it is save to state that the community prioritizes how seamless the gameplay is and how balanced the game is.
Improve your production pipeline - improve the QA process.