Probably because I don't consider it bad.
I like how only one of your points is objective.Now every expansion has its faults, nothing is perfect. But to date, the worst so far is cata, from the way it pandered to the hardcore minority (they honestly admitted they did this and it was a mistake), made the world feel broken apart, the horrible and boring max level content, and the way the lore worked, how it butchered the lore in so many ways.
MUST BE RIGHT!