Blizzard famously released stats on subs after WOD. If you believe that information, subs platoed on WOTLK-Cata, then started going down with Pandaria, and every subsequent expansion did worse than the previous one, untill wow classic was released.
And now that there are several versions of WOW, we the simple folk cant even tell, if people are actually playing retail, or only the legacy mods lol.
So based on those subscription stats, WOD performed with general public somewhat according to the existing trend of that time. However, Legion, BFA etc., which had less subscribers than WOD, were praised by “the community”, but WOD was for all intentents and purposes “cancelled”. As with many “cancellations” it is a storm in a teapot of sorts.
Basically, WOD did not have enough top-end content, raids, farms etc., so the players, who exceed average play time by a considerable margin, quickly ran out of things to do. WOD was aimed at casual players, not raiders and not many other elite groups. There was a lot about wod, that was against special interest of different groups of professional and semi-professional players, most of all the garrison.
As the result, the player elite divided into two camps: camp “give us more content to grind and now” and camp “stop making content now, make next expansion”. Either position meant criticizing WOD and thats what you see on the forum and youtube.
Blizzard has taken the whole situation to heart and since then popped out as many grinds, mythic, limited-time alternative gamemodes farms and other content for bored wow-heads as possible, to avoid another youtube slaughter.
And thats the WOD teapot storm.
Its just a forum/youtube thing. Does not have anything to do with the general wow public.
Its like, you know, when 5 people come out to protest, so the news agency shows them up real close, so you cant tell its not a revolution.
or at least thats the picture we get from existing information, maybe, blizz will reveal something new later, who knows.