Definitely my favorite zone would be Stranglethorn Vale before cataclysm. First of all it was very exotic with a huge assortment of creatures. Second of all the amount of world pvp that clashed in the zone was staggering and could be real annoying if you were the unfortunate lowbie, but fun and time consuming if you were the main.
Winterspring! it's a truly fascinating zone that has no analogue in any other expansion (Sotm Peaks can't even compare!). It's the zone I always visit when I start getting bored aas it makes me feel just...so good inside. :)
I'd pick Teldrassil. Why you may ask? Well, because it's magical sounds. I always enjoyed leveling a night elf there :)
I always enjoyed Nagrand as well, just a fantastic looking zone with many quests that tied in to the lore of the orcs, and gave us war-chief campfire!
I have a favorite zone in each expansion.In vanilla WoW I loved the Plaguelands. It was very spooky, especially western plaguelands. Killing zombies and ghouls was very fun. I really enjoyed questing there. And I loved doing Scholomance and Stratholme instances along with capturing the PVP towers. Also the flight master mounts were beautiful ghost like gryphons I really wish I had one of those.In BC, my favorite zone was shadowmoon valley. The quests there were extremely fun to do, fighting demons and the daily quests for getting the netherdrakes kept me entertained for hours on end. The designs for the demon areas were incredible along with when the infernal demons would rain from the sky and fight the guards at the alliance and horde towns there. Shadowmoon also had the Black Temple entrance where you had to fight the demons to get in.In WOTLK my favorite zone was Crystalsong forest, because the design of the ENTIRE area was just absolutely gorgeous, especially having a city in the zone that floated high above the ground (Dalaran). The designs of the giant trees actually looked like they were made of crystals, I always loved flying through that zone whenever I had to go anywhere.In Cata my favorite zone is Deepholm, one big reason was that ever since WoW was made, I always wanted to know what is in the center of the Maelstorm. When they finally made the expansion I was so excited to go and explore that zone. Everything made of different colored rocks and gems looked outstanding. I also loved doing all those quests for the GIGANTIC NPCs. And the Idea of that giant Pillar in the center of the zone held up the world reminded me of greek mythology where there was a pillar that held up mt. olympus. Everything there was gorgeous and fun to do. Overall I think Deepholm was my favorite zone entirely.
my favorite zone is still BRD, it is soo big and so much to do. It is sad that they took the ony key quest out, it was fun running people through that in there.
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My favorite zone has, and always will be, Stranglethorn Vale. I love how different it can be depending on the area you're in -- along the coast or over with the trolls in ZG. Plus it hosts the arena, and a fishing competition -- how can you go wrong?
My favorite zone has always been been Tirisfal Glades The overall feel they gave Undead is superb. I haven't leveled there since the Shattering, but I'm sure it's still just as epic!
I like Hellfire Peninsula is my favorite. The bombing missions are fun and provide a good break from some of the old kill questing grind. As a whole I like the new zones for this same reason since there is a lot of quest type variety. Hard question for me to answer since in general I despise questing.
By far i would have to say Vashj'ir. it something totally unlike anything else they have done before. the fact that it was underwater and you could go in all directions and be fighting guys above below and all round you was amazing. in a game where many of the areas cosmetically different but still its run around on the ground i thought it was a refreshing change from the norm and it was incredible to look at. i would love to see more like this departure from the cookie cutter areas. WELL DONE BLIZZ!
At first I was thinking of world zones only, but I saw a mention of Karazhan and I just simply have to agree with this. Karazhan was hands-down my favorite zone of all time. I absolutely loved this raid. The atmosphere and the boss mechanics were awesome. Maybe it's because I really started my raiding "career" in Karazhan and I'm awash with nostalgia, but I Karazhan, to me, was the pinnacle of everything a raid instance should be. Expansive environment, well varied, progressive, small gimmick game, well themed, immersive, and definitely held the whole fantasy vibe. I could go on about Kara for a long time. Love it.