My persnal favorite zone would have to be Dragonblight. I loved the story involved in the area. Not to mention it had some of my favorite instances in wrath.
Without a doubt, Vash'jir is the greatest zone of all time. I love the engaging story, especially its length and flow. The surrounding environment is truly the most beautiful in all of WoW. I also like it because of what it represents to me, my fear of underwater and how i was able to conquer it (at least in game).
I just love sitting around in Nagrand. Watching the herds roam by and listening to the thundering waterfalls. Great way to spend an afternoon.
I loved Nagrand back at 70 when I first got my flying mount. Those floating islands were the perfect spot to afk or buff on my PVE server, and the view was awesome as well!
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Grizzly Hills - Music and setting <3
I actually liked Zangarmarsh. It just felt awesome questing in that zone, like it all had one big goal.
I've always found Winterspring to be magical. I know some people think it's bland because of the overwhelming amount of snow, but I find it to be quite pretty. However, the expansive zone of Vashj'ir is quickly becoming my new favorite! The designers and developers did an amazing job with it, and I'm looking forward to revisiting it on other toons.
I've always been a fan of the Hinterlands. On my very first character I remember going there and really enjoying the quest chains. The old mallet of zul'farrak quest felt alot like an outdoor instance with pvp elements and that was really fresh for a level 48 back then. And of course I still remember wandering into the green dragon area, and rushing the elites trying to get through that portal... MAKE IT CONNECT TO SOMETHING BLIZZ! :P
Pre-Cata my favorite zone was Eversong Woods. Such a pretty landscape and the music is lovely. Post Cata it's a tie between Vashj'ir simply because it's a totally new concept for a zone and Hillsbrad for the hilarious quests!
Certainly nagrand. After plowing through Hellfire Peninsula then Zangarmarsh, this zone provided a very, very welcome change of scenery, the whole serene and tranquil feel of place made for a refreshing break in an otherwise relentless sea of soul destroying zones, and made the grind up to level 70 bareable again.
My favorite zone is Ungoro. I started playing back in vanilla and I will never forget the moment when i was loping along on my mount and a Devilsaur ran out of the fog. It actually made me jump in my chair and still gives me a thrill today when they come barrelling out of the mist.
I think my favorite zone would be Uldum. I really like all the Egyptian stuff. =)
My favourite zone is Dragonblight simply because of the two quests where you first help your future self, then at level 80, you help your past self help you. Paradox!
I gotta say that my favorite zone has changed with the recent expansion. Mount Hyjal impressed me with all of it's phasing, new style questing, multiple quest lines, and an epic struggle against Ragnaros with the aid of Archdruid Hamuul Runetotem, Archdruid Malfurion Stormrage, and Cenarius of all people. The entire zone is a major lead into the next part of the expansion: The Firelands! From escorting Ex-Archdruid Fandral Staghelm and resurrecting the demi-gods to infiltrating the Twilight Hammer Cult and finding out that we have the ability to help in the resurrection of Cenarius and his direct confrontation of Ragnaros.The fact that we start in a forested area, leading down to charred ashes of what once was, only to see it regrow before our very eyes makes it a dynamic zone and always a must for any one leveling in the cata zones for the first timeWe cannot forget the call backs to favored MC bosses like Baron Gheddon, the elusive rare spawn of Garr, and the not-yet-legged-Ragnaros!It has lush environments and multiple key story points that tie into the rest of the expansion.
I would have to say Netherstorm. I just loved that zone when leveling up, it felt so different, which was probably due to it being purple. The Area 51 town was my favorite quest hub because it made me feel like a secret agent every time I entered it!
My favorite zone is definitely Grizzly Hills. The music alone makes the entire area feel both rustic and epic. Plus Harrison Jones is there!