Twilight Highlands is currently the highest level zone in the expansion, the planet of azeroth, and the overall game. As I was questing thru the zone the other day, something struck me as being a little odd. Twilight Highlands (hereafter, TH) doesn't quite seem as ominous as previous highest level zones. Think about Shadowmoon Valley (SV) for burning crusade. THink about Silithus or Eastern Plaguelands (EPL). Then of course, recall Icecrown. The Lich King's backyard, an entire zone swarming with the Scourge. That whole zone was ominous and dangerous - one of the highest level zones of the previous expansion.
As I tried to convince a dwarf named Fanny, to marry another dwarf (firebeard i think?), then subsequently went to gather items for their wedding....I couldn't help but think that this zone, the highest lvl and in theory the most dangerous zone of all, doesn't seem all that foreboding. Then I went exploring....yes there's the giant tenticle monster Iso'rath - which was cool. And there's that place over by the Twilight Citadel. But overall the majority of the zone is about as scary/epic as say borean tundra.
That's cool if you disagree with me...but think about Icecrown. Picture that zone in your mind, then think about TH. There's only a few spots of the zone that's effed up. I would think the whole place would be effed up - as was the case with previous expansions.