It has its moments (the siege of Averheim chief among them) and I have a soft spot for how accurate the council of incarnates is (I have worked in politics and the vibe of "I want to get rid of you but I can't and worse I have to make deals with you" is the core of Belgian politics). However it all falls a bit flat.
My core issue is that all four of the previous books are undermined by this one; Nagash the first book of the end times starts with the return of Nagash and his army of the dead united. Amazing thrilling stuff so what has Nagash been doing since? Nothing he sits on a throne leeching magic. I mean its not that it is implausible but it is also so underwhelming. Vlad Van Carnstein has been the sole redeeming factor of the whole undead sub plot and even then it was all a bit lackluster. The Fall of Altdorf, well the second fall actually and the return of Sigmar (I mean it is so obvious since book 2) is so casually glossed over making the epic of the nurgle infestation/invasion feel cheap and filler like.
The Khaine book and the end times for the elves had as a huge sub plot the "haven" of Liath but that is snuffed out, literally its all gone in a few sentences making me think it was an idea pitched and latter retconned by the games workshop lore keepers. But even more frustrating is the rebirth of Tyrion. His and his brother Teclis arch had ended and it was perfectly greek inspired tragedy but in one swoop it is all undone. There are other candidates for the role of incarnate of light, it could have been Giles de Breton whose return is even more glossed over then Sigmar's and would make the whole, the elf godess made the Bretonnians for them to become the paragons of light to be the awesome lore reversal but no Tyrion it is then. Sigh.
Finally the Thanquol book, the high point of this series, well Thanquol is gone simply gone. Where the hell is he? And what about Skarsnik? Now I know that Skarsnik had literally been forgotten by the writers and they tried to be like "well he was there in the end just in the background or something) now that is simply awful and shameful. He could easily have been there and taken up the mantle of Grimgor, giving a sort of spectral gobla? That would have been awesome! But halass. Speaking of Grimgor, that too shines in abscence; "the east is green" well to bad we never read anything beyond a paragraph how Grimgor and Gotrek maneater bashed open the zigguraths of the chaos dwarfs and freed all the greenskin slaves. sigh.
The end times were meant to be the final closure on the old warhammer world and lead in the world of the age of sigmar and you see glimpses of what is to come. The Azyr lightning bridges, the elemental fusing of both dwarfs and elves with elements of fire, shadow and life, Nagash as the uncaring (and very lazy) god of undead. The end times has its tragic moments, it really does something to me to see it all end but it could have and should have had a few more brainstorms. Off course we have to talk about Mannfred. Yeah well I was so sick of him and his final act is so stupid that it is beyond idiocy; why not have thanquol do something stupidly ambitious right then and there? That would have worked so much better halass for not.
It could have been and should have been more.