It's understandable that GW has to have the stories in a certain way, they do have to try to placate every different fangroup while still keeping certain things the way they want it and furthering their own agendas. What I am disappointed about, though, is how poorly written and inconsistent their fluff is. For instance:
Grimgor wanted the crown because he wanted everyone to fight him, and having the crown was going to make them do just that. Well, he's finally standing in front of said everyone, and he runs away.
The winds of magic fail. Despite the chaos moon waxing in the sky. This causes the skaven and chaos to flee right off the map. Just like that. While Skaven make fleeing a professional sport, the Khornates shouldn't even have blinked. Magic, what magic?
The Grey Seers feeling like they have no place in the world was just a poor explanation. Megalomaniacs suddenly developing a case of low self-esteem?
The gobbo puts on the crown that gives him the distilled hatred and malice of everyone who has ever worn it, turning him into an uber-gobbo with some super hatred of dwarves. Especially if it was a night goblin, IIRC they have that Hates Dwarves rule. For some unknown reason he seemed to have ended up with their distilled phobias instead, and screams like a girl upon seeing a dwarf. Did I miss the rule that dwarves cause Fear in goblins?
A screaming gobbo makes the black orcs flee in fear. Wow.
I don't mind the outcome of the campaign, but reading decent fluff for the finale would have been nice...