No, not literally every single piece of story/lore this expansion, but a lot to be sure. Let me give you a potent example of what I mean:
Kel'thuzad. He was a character I was looking forward to. What I wanted was for the Kel'thuzad of Warcraft 3 yore to return and give us an excellent performance. What we instead received was Kel'thuzad from Hearthstone - transported directly into WoW - a comical and one-dimensional sandbag solely existing to drive the terrible main plotline forward.
Kel'thuzad was a layered and interesting villain in WC3 and early WoW, by all accounts a sociopath in life yet terrified and feeble when faced with the might of the Scourge, transformed into a deathly loyal servant of The Lich King, willing to die by the hands of Arthas, knowing he would later ascend to Lichdom. Even afterward, one poignant scene with him and Arthas shows him being viewed as a friend by Arthas - an interesting twist of fate. He was at all times absolutely competent, yet evil, but not in a comical nature.
So... Why? Why can't we get more grounded, layered and mature stories in WoW these days? Isn't the majority of the playerbase in their late 20s/early 30s now? I can't imagine many teenagers are playing this game so late into its lifespan. Why this insipid adherence to Marvel-esque quip-happy storytelling? I feel like the writing team would love to just write all of WoW in the style of the Traveler series of children's books.