Shadowlands is the culmination of multiple failures on Blizzard's storytelling team. The absurd escalation to "the precursorers of the precursors!" and "Jailer and Sylvanas are even moar powerful!", trampling on the fans' investment in the lore of Warcraft with the retcons and smashing the religions of Warcraft, the lack of stakes with dying being rendered irrelevant and mundane, the unsatisfying and anticlimatic resolution to storylines such as Sylvanas burning the tree ("you must forgive the mass murderer who genocided your race!"), and so on.
The biggest problem with Shadowlands is that the audience no longer cares. The writers have destroyed any shred of credibility they once had. They have failed basic storytelling 101, failing to communicate to the audience what the villain's motivations are, or what the stakes are, or endear the audience to the characters. hardly anyone cares about the setting, or the Covenants and their leaders, or the Jailor. Fanart is a pretty good indicator of how much people like the characters, and yet I hardly see any fanart for Shadowlands characters. Denathrius is the only SL guy I can think of who got any fanart. When people talk about the Shadowlands story, it seems they only really care about old characters like Anduin, because of the audience's prior investment in those characters when they were written by better writers.