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My favorite zone is Orgrimmar. Above the Valley of Wisdom on the cliff. It is nice and peaceful up there watching the creatures run around and not a lot of noise. Also had nice long conversations with the girl I fell in love with up there. So its special.
Karazhan, hands down. Though I didn't have much opportunity to raid in there while it was relevant, it was the perfect blend of visuals, music, mood, purpose...it just had the perfect combination of elements to make it very memorable.
Stonetalon, because of the epic questline!
Ulduar is the most visually pleasing.
Sorry guys, but Durotar (The Dranosh'ar Blockade) is far the best zone in the game. You can spend the whole day having fun in that place watching people`s PvP and, some times, PvE gear, chatting with your friends while you wait for queues, meeting new people that goes there every day and, of course, dueling others champions to test your skills. (Duels are FUN :))And since Cataclysm the zone is much better looking now. ( if you don't play horde check this fan art at http://i54.tinypic.com/6gxue0.jpgBut if you are new Durotar I must warn you about the dangerous creature in this zone : The Wild Mature Swine . I have already seen many 85 Level Champions falling to theses nasty beats in this zone :)
My favorite would have to be the original Un'Goro. I liked the crystal cave and the threat of a giant dinosaur walking around looking to eat you.
My favorite zone is Ashenvale. Maybe party because it was one of the first zones i've ever been but i still remember the magical elvish atmosphere it was able to create.
my favorite zone is nagrand because i'd like to live there if it wasn't war:P
Abyssal Depths is the most beautiful zone ever. It's blue.. Vast expansion of the blue ocean is always an intriguing sight. It embodies the under water world of animals, plants, insects apart from great secrets, treasures, misfortunes and resources. It's the real peace.. What started a quest for treasure led to some astonishing discoveries and making players entering beyond dream imagination even the light can't go through there.. It's where i wanna go.. While the most of the players know only few animals which they are seeing in their day to day life or on television, i'm so thankful of seeing an amazing place with World of Warcraft..
My favourite zone is old desolace, because I tested my brand new whirlwind axe first time there and slaughtered billions of magram clan centaurs for reputation to gelkis clan centaurs 6 years ago and there is also ghost kodos in desolace.
There is nothing better than Westfall! I liked it before, but the changes do a wonderful job of introducing things, like lore and new changes. It's fun yet challenging at level.
Elwynn Forest - the original. Because it has Hogger.
NagrandPeaceful and pretty
Nagrand was the place i like the most, don't know exactly why but when i arrive there for the first time, it was magical for me...
A very tough decision, but I'd say my favorite zone was Stranglethorn Vale because of my love for nature. Its filled with several types of beasts and also several memories of my life of leveling. Though I haven't been there since the Shattering, so I don't even know if it has changed, I will always love this old jungle paradise.