Lol, when i watched Avatar. I kept thinking that the Pandora rainforest= Zangarmarsh.
Ya, Zangarmarsh was one of my favourite zones. Too little quests in that area though. It only lasted for 2 levels.

Nagrand is awesome, but it was an annoying place to lvl with so much travelling time involved, especially when your faction is not controlling halaa (God damn detour around the cliff). This was back when flying mounts are limited to lv70, not the current mount system change)

Ashzara is the worst place in WOW imo. Little quests hubs, god damn huge area. Theres a few quests in there require you to swim to an island outside ashzara. Oh yeah, if you go to the shore, you need to run all the way back around the cliff area to get back up. (You might as well just hearth)
This was back in Vanilla though. No one goes there anymore, unless you are doing Loremaster stuff.

Same thing applies to Desolace. Freaking huuuge area of emptiness. Remember the quest where you gotta find Rexxar for Onyxia chain during Vanilla. He walks like 1mile per hour and travels aaaallll the way to another zone.
"insert FFFFUUUUU- rage pic"