Eastern Plaguelands for me.
It’s a worsened version of Badlands.
Not only is the map packed with wildlife ever so constantly dismounting, slowing, fearing, silencing and stunning you everywhere you go, you have to deal with the Horde griefing Light’s Hope Chapel the entire time. It never gets better because everything is near level 60 and will continue to bother you forever. To top it all off, everywhere you go has the same purple color with little to no difference on the looks.
Cursed be Eastern Plaguelands a thousand times.