Wrath of the Righteous has a few... strange spots.
The Midnight Isles (book 4) isn't bad, but it's weird, given the context of the rest of the campaign. After slaying demons and building a holy stronghold in the middle of a ruined landscape, the players go and treat with an exceptionally cosmopolitan demon city. It's not the worst, it's just... irrelevant to the plot. As a story, it would have fit far better with being a corrupted Sarkoris city IN the Worldwound itself - not some strange planar area completely unrelated to the main plot.
City of Locusts (book 6) is atrocious. As endings go, it is hands-down the worst of any AP. You don't fight Deskari (the demon lord who rules the worldwound) because it's "beyond the scope of this adventure"; you don't actually do anything with the City of Locusts, i.e. the conquered capitol of old Sarkoris; the only things you do is faff about in a demon brothel with some inexplicably mythic-level, murderous succubi-prostitutes (who are also drug dealers!), followed by solving the "mystery" of the origins of the worldwound (which isn't a mystery because everyone already knows how it originated; this subquest just fills in some of the particulars like "it wasn't just in may, but may FIFTH that the worldwound formed! wow!). It ends with fighting some succubus queens, then another BIGGER succubus queen, after fighting some other succubus queens.
Considering that The Ivory Labyrinth (book 5) ends on the incredible high note of slaughtering a demon lord in the middle of his own stronghold, City of Locusts is unbelievable in... just how much of a let-down it is. It's been almost a year and I'm still very bitter about it :(
Uh you do fight Deskari?