Favorite zone from each expac?

[Haytham]

Classic - Ashenvale
TBC - Nagrand
Wotlk - Very hard because i liked so many of them but i think Grizzly hills or Storm Peaks
Cata - Vashj'ir , it's just a superb zone
MoP - I pretty much hated all the zones except Krasarang Wilds , so i guess i'll go with that
WoD - Gorgrond

Zone design has changed much throughout the years, and it has changed for the worst. Gone are the zones that have a area or a road there just so it looks cool or to make the zone be / feel larger, zones now are a nothing but a point A to point B path where you go and kill the quest mob,a poor choice.

[Blandalf]

Classic: Westfall or Southshore.
TBC: Nagrand.
Wrath: Storm Peaks.
Cata: Uldum.
Mists: Krasarang Wilds.
Warlords: Nagrand.

[Zka]

Vanilla: Duskwood. Best atmosphere. Tie with Stranglethorn.
Tbc: HFP, because first new zone ever OMGHYPE
wrath: Sholazar Basin. I generally hated all zones here, because levelling was too long and boring. This one at least looked good.
cata: Vashj'ir. Hated it first for being hard to navigate, but the artwork and the story makes it one of the best zones ever.
mop: All so boring, maybe the one that hosts the stupid farm.
wod: All of them are amazing, most of them host diverse themes, I can't pick one.

[bison91]

wow: have 2, western plague lands and the barens.
bc: hellfire peninsula. the red land with red orcs is my best theme!
wotlk: nothing, maybe howling fjord.
cata: barens, stonetalon mountain, tarren mill.
mists: nothing :P.
wod: frostfire ridge.

[Shinrael]

Vanilla: Mulgorein terms of design, Hillsbrad Foothills in terms of fun
TBC: Nagrand
WotLK: Sholazar Basin
Cata: The Lost Isles
MoP: Valley of the Four Winds in terms of design, Jade Forest in terms of fun
WoD: Nagrand in terms of design, Shadowmoon Valley in terms of fun

Can't wait to see the new zones in the new expansion. I already feel the thrill of adventure!

[Nightcrwler]

Vanilla - Duskwood
TBC - Nagrand/Hellfire
Wotlk - Grizzly Hills/Stormpeaks/Howling Fjord
Cata - Uldum
MoP - Jade Forest
WoD - Shadowmoon Valley

[Dezminion]

Vanilla: Barrens
TBC: None
WotLK: Icecrown
Cata: Mount Hyjal
MoP: Jade Forrest
WoD: Stupid maze design, so none

[Deleted]

Zone design has changed much throughout the years, and it has changed for the worst. Gone are the zones that have a area or a road there just so it looks cool or to make the zone be / feel larger, zones now are a nothing but a point A to point B path where you go and kill the quest mob,a poor choice.

What are you talking about? WoD had plenty of hidden stuff and areas you wouldn't usually explore while questing. I think they took a step into the right direction.

My favorites go like this:
Classic: Darkshore. The cataclysm almost broke my heart.
BC: Eversong Forest. Rarely has music enchanted me like this.
WotLK: Wintergrasp? Grizzly Hills? Howling Fjord? I don't know.
Cata: Vashj'ir. The story was very enjoyable and the music was ever so fitting. Plus I finally got to see the gnome submarine from the inside.
MoP: Jade Forest. But I also enjoyed the Kun Lai Summit. And again, the music. The MUSIC!
WoD: Shadowmoon Valley, hands down. It was sad that the further questing expirience could not keep up with it. Although Spires of Arak had an interesting story and some fitting music.

[Zooey]

Winterspring
Zangarmarsh
Grizzly Hilla
Winterspring
Vale of eternal blodsoms (pre rape) - the jade forest after
Shadowmoon valley

Id say winterspring on all since it is my alltime fav zone but yeah.

[Deleted]

Vanilla:Tirisfal Glades and Dun Morogh because those were the 2 zones I started in and during the leveling process Winterspring.
Burning Crusade: Eversong Forest only made a Blood Elf to level 10-12 to quest there and see it.
Wrath: Tough choice between Grizzly Hills and Howling Fjord.
Cata: I'll go for revamped Desolace.
Mists: Kun Lai Summit but that's mostly because of the quests in the mountains.
Warlords: Shadowmoon Valley.

[Deleted]

Vanilla: Loved Loch Modan and the dam. Lore-wise, anything to do with Blackrock Mountain.
TBC: Netherstorm. All those magi-punk aesthetics to exploit or preserve the resources of a dead land were great.
WotLK: None really sticks out, they were all rather good.
Cata: Deepholm was great, I'd love to see another underground zone that isn't that circular. Uldum was the most fun, though.
MoP: Jade Forest was so incredibly dense in all axis and flowed really well. Kun-Lai had the most interesting mechanics while questing.
WoD: Arak had the only interesting stories but I hated the level design. Nagrand actually did something with the cliffs that wasn't just height-map based; I found that rather refreshing. Talador had some cool treasures, but all Draenei can go die in a ditch.

[Akta]

Classic: Moonglade
TBC: Zangramarsh
WotLK: Storm Peaks
Cata: Vashj'ir - sure the pathing issues could be a minor annoyance but it's a unique zone that's a lot of fun
MoP: Kun lai
WoD: Frostfire ridge

[Ryme]

Classic: Winterspring
TBC: Nagrand
WotLK: ... so hard... Storm Peaks, just.
Cata: Vashjir
MoP: Kun-Lai Summit
WoD: Spires of Arak

[Morbownz]

Zone design has changed much throughout the years, and it has changed for the worst. Gone are the zones that have a area or a road there just so it looks cool or to make the zone be / feel larger, zones now are a nothing but a point A to point B path where you go and kill the quest mob,a poor choice.

Absolutely, I'm really disappointed that Blizzard didn't develop this area of the game. They just switched it out instead.