You’re free to disagree, but you’re wrong all the same.
Just to quote myself with an edit:
Fun fact, the server instabilities due to bugs in Warlords of Draenor even hit the damn news!
https://www.bbc.com/news/technology-30079037
And if I had the energy and time, I could probably trawl through years and years of posts (including posts on Wowhead, MMO-Champion and Reddit) to find all sorts of complaints about serious bugs that had major impacts on the game.
Which is why this expansion’s bugs have been small-fry bugs. The most significant bug that this expansion has had wasn’t even one that affected most players; it was the bug that impacted the Undermine Race for World First contest.