The zone I always do, is dragonblight. It's my favorite because of the wrathgate cinematic, and it's a chain I do on all my characters.
Duskwood is my favorite for sure. When ever I lvl'd a character, I always made my way through there. So gloomy and spooky, always some eyes pearing at you from the bushes, making sure you don't feel alone ;)
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I too like Uldum. I love the Harrison Jones quests as well and the beautiful buildings.
Hellfire... The first time I walked out of the Dark Portal I just gasped... The Landscape is stunning but eerily desolate and the chaos going around just as you enter adds even more to the mood.
Deepholm. Is by the way my favorite Zone. The Arhitecture is amazing , also the music is perfect and Thematic. When i go to Deepholm i fell like my mind goes really , really Quiet.
My favorite zone would have to be Zangarmarsh. I loved how the zone was laid out, how the environment effects were (the pollen floating around on your screen), and all the different types of factions in that zone. It also had some very unique creatures in the zone.
The Searing Gorge is my favourite Zone. Why? Because there are so many dwarves and the Blackrock, home of Ragnaros, Rend Blackhand, Nefarian and so on.
My favorite zone is probably Karazhan, there so much good thing in it : boss (shade of aran), fun (opera), environment (painting and candlestick) etc. Medivh make very good choice, and we see only half of the zone :).
Duskwood is my favorite zone. the ambiance of the lighting and the general style of the zone give a real dark fantasy feel.
My favorite zone is The Barrens(Northern Barrens in Cata) because it reminds me of my first days in World of Warcraft.Every time I look at it I remember how it took me an hour to find Mankrik's wife.Back then I didn't know what Wowhead was of course :).
my favorite zone is Uldum due to Harrison Jones~ <3
My favorite zone is Duskwood. I love the quests there. It really feels like it was a nice town at one point and then got overrun by the undead. I really like killing the undead and doing the quest where you have to place the ring at the grave and get the sword as a reward. Sad quests there. I always take every character that I level through that one zone. I loved it since I first leveled my warlock through there.
Netherstorm is just aesthetically perfect. The colours are beautiful, the landscape is awe inspiring and the quests flow so well. For me it is the climax of outland, the pinnacle of draenor's destruction; you can so clearly see how the world has been torn apart and just being there feels dangerous, like the world could implode at any second and disolve every atom in your body to nothingness. Orc lore is probably my favourite in wow, so exploring outland was a lot of fun for me and Netherstorm just made my jaw drop :)