The way the quest and storylines seem to be laid out are amazing! I love how each zone is a different chapter in the story of WoD, and Garrisons are like their own bonus chapter, but still connect to the overall storyline of Draenor. We saw some of this "chapter-based questing" a little bit in Cata with zone revamps and 85 content, then we saw it even better in MoP w/ each questing zone. Now it seems to be alot more refined and fleshed out than ever before. Awesome!
I also like how the side quests are separate from the main story so players do't loose immersion in lots of grinding and it doesnt take away from the story. I also love those bonus objectives, seems pretty cool. The fact that they have 33 rares and 41 treasures for one zone makes me wonder about other zones as well! Now people can see why Blizz removed flying, all of that explorable content would be completely undermined. Exploring isnt the same when you're flying over it all. When WoD drops first thing i'll do is explore the continent instead of quest.
Overall the zone content seems pretty good. This should be one of WoD's big features IYAM, it's pretty exciting so far! Great work Blizz-Boys!