All this stuff said, some people have said look at what Mr Happy is saying:
https://www.youtube.com/watch?v=CrVyf3B07SU
I'd like to note someone basically presented him this question of if EW will, in hindsight, be the worst expansion. Without missing a beat, he says no, HW has that dubious honor. He goes into his reasoning why, then lists his best to worst as SB, ShB, EW, ARR, and then HW. His reasoning is that, until 3.4, there was nothing for anyone to do unless they were hardcore raiders, and that even for the raiders, it was kind of Gordias or bust, and many raid groups were not able to clear that content on patch. Happy's been pretty consistent about saying HW almost killed the game again.
Note that he does share the big concern many here have expressed, though: That EW's content largely lacks replayability, something he says that SE needs to address going forward.
So given we're trying to consider the words of content creators, and Happy is PROBABLY the most widely consumed and well known of them, I think it's fair to introduce his position as a more moderate voice of fairness here. Note again, he still DOES share the complaint, but he's got reasoning (and personal experience) behind why he says HW was the worst in this respect and that EW is "in the middle", to use his wording.