Thriller Bark is just a bit self contained, that's all. It actually has a great and creative story regardless anyway, and part of what makes One Piece so great is that the world is so whacky. I agree that Brook is the worst Straw Hat but the Straw Hats aren't really that well developed since Part II besides Sanji. The rest of the flaws you pointed out are more trivial. You really have a bad habit of nitpicking flaws even if they're occasionally trivial.
Moriah is really one of the best Warlords along with Crocodile, Blackbeard, and Kuma. The rest are all inferior. I wouldn't really pay mind to his zombies being immune to the sun so much, as Marineford had more inconsistencies than most Part I One Piece Arcs anyway, even Thriller Bark, which you seem to greatly dislike.
Arlong Park is really overrated. As I said, the Arcs before Alabasta kept getting better. No One Piece Arc before Alabasta was outstanding or anything, not even the Baroque Works Arcs which had a lot more worldbuilding than any East Blue Arc, including even Arlong Park which introduced Fishmen. Nami's backstory was sad sure, but so were the rest of the Straw Hats' except maybe Usopp's. Brook's, Robin's, Chopper's, and even Franky's are worse. Sanji's has potential to be sadder too.
... Not even sure why you quoted that abstract statement, considering we both agree that the flaws Dressrosa and Punk Hazard share with Marineford are a lot more magnified.