I have a tough time summarizing my complaints with this book, but I want to be as clear as I can, so let me put some things into context. Also there's some spoilers in here, but if you're GMing this they're well worth knowing before you buy this.
You will be returning to Avistan with what essentially amounts to a narrative "doomsday clock" over your head. No, not a hard one like in Wrath of the Righteous, but certainly the fact that the Whispering Tyrant is basically going to win tomorrow is pretty huge. So, with that in mind, let's look at some of the things Paizo wastes pages on while you are (presumably) rushing to save the world:
-An encounter with a wild hunt you're strong enough to fight wanting to "play hunt" with you, along with 5 pages of rules for how to do it.
-gambling with a rawhead
-dining with a Daughter of Urgathoa
-playing undead politics
To say nothing of the utterly baffling pacing of this, it also seems so unbelievably rushed in the places that matter. The whole plot is a mess; literally 2/3rds of the game exist to allow you to do a dungeon, since Tar-Baphon "made his generals retake their vows to him" and then for no particular reason only moved 1/2 his army to Absalom seemingly allow the PC's to enter his spooky dungeon and have something to fight. But in the end, you're expected to fight him alongside your newest friends, who are so important you meet them about 2 hours prior and they don't even have unique stat blocks.
You do not reach level 20, and in the end you die. But not just die; no, you sacrifice your SOULS to stop Tar-Baphon, consigning yourself to oblivion. Now, that's the stuff of legends right there IF IT'S HANDLED WELL, but having just read 2E's world guide, do you know what happens to Tar-Baphon?
He just comes back in a bit and is now scheming away on the Isle of Terror. The Lost Omens guide literally invalidates the actions of this whole AP. The book ends with a throwaway line about "the Whispering Tyrant still being out there woooooooo" before immediately rushing to show off some special creations of the writers on staff, and then it's OFF TO 2E!
This book was an underwhelming mess, poorly paced, badly bloated, and yet somehow unbelievably rushed. I honestly can't believe they allowed one of their most notorious villains to be portrayed like this, and now that he's back it means the entire AP was worth far less than the amount of money I paid for it. If you can, either rewrite this book yourself for your group, or just skip this AP. It's completely meaningless anyways.