What bugs me even more is how Blizzard disregarded the great zone transitions they placed inside Northrend going forward into Cataclysm and made no effort to fix it.
Old World Azeroth looks bad at the edges of zones, really bad.
Flying mounts made Kalimdor and EK look even more like a carton of multi-colored Easter Eggs and as I do my trick or treating I can't help but feel queasy about how geographically impossible and inconceivable zone edgework looks. Lets look at how the actual Earth makes a gradual change into a different temperate zone.
Ashenvale's lush, humid environment contrast to the Barrens in direct contact with eachother could have been a part of multiple real life explanations - none of which presented in-game, such as differing elevations.
So, the question from all this is, what the heck are the environment artists doing in old world Azeroth? Why does Northrend and Pandaria smoothly transition from zone to zone almost seamlessly, yet we go from hot volcanos and lava to snowy Dun Morogh with only little cliffs seperating them? Or go from Stranglethorn Vale to Westfall crossing a little river? Did Blizzard originally design zones individually then slap them together like puzzle pieces? Even rock colors and textures just change instantly as you fly over a zone. A massive missed opportunity to fix this with Cataclysm, I'm afraid it may never be addressed.