It's sad that the weakest part of ADWD involved two of its main characters in Tyrion and Dany, who both take up a good half of the book.
Dany - She starts out in ADWD as Queen of Meereen, being conspired against by the Sons of the Harpies within her walls, and besieged by Yunkai from without. By the end of ADWD...she's still in Meereen, being conspired against by the Sons of the Harpies within her walls, and besieged by Yunkai from without. She was never one of my favorite PoV's in the past, but I didn't mind her. I absolutely despise her character and her stupidity in ADWD.
Tyrion - Ever since he got separated from Griff, nearly all his journeys have felt like contrived circumstances brought upon by the author to bring him from Point A to Point B. And technically, if Point B is Dany, he hasn't even reached it, which is beyond frustrating since before I read ADWD, I thought we were finally going to have meaningful interactions between two of the main characters of the story, but as usual, GRRM likes to tease us with characters' arcs converging, but then they always get waylaid. Tyrion, once a favorite character in this series, was a sidestory in ADWD who had literally no impact on the narrative except to send Aegon west.
Both of them could've been condensed to half their chapters.
As for Jon...well, pretty much any PoV chapter in the North was a highlight in the book for me. From Asha to Reek to even Davos (who has normally been a boring supplicant to Stannis for most of ASOIAF). You can literally feel the building tension between Stannis vs. the Boltons. The only disappointment, as others have stated, is that this tension was never properly released with an epic climax like we had in ACOK with the Battle of Blackwater or ASOS with Jon's defense of the wall and Tyrion's trial for Joff's murder.
The only Jon chapter that I didn't enjoy was his final one. And that's only because I rolled my eyes at his supposed "death," which is actually a pretty damning criticism against GRRM. This was the writer who had previously shocked us with Ned's beheading, Robb's betrayal, but does anyone actually think Jon is truly dead here? He has so many outs -- Melisandre can bring him back with the kiss of life; he can warg like Bran; hell, his dagger wounds may not have even been fatal. GRRM has toyed us with so many fake deaths to the point that its lost its impact in this series.
It's also a really shitty cliffhanger to leave on, considering it took him 7 years to write this latest book. I absolutely hate cliffhangers in any medium that leave you asking, "did that really happen," instead of "what happens next?" The latter makes you crave the next book even more, but doesn't leave you unsatisfied -- Dany hatching dragons, Jon killing Qhorin and mingling with the Wildlings, Tyrion killing his father and escaping King's Landing. The former leaves you hanging, like Brienne's "death."