In no particular order.....maidens, vt, ssra temple, bot, wos, mpg, velks, kedge keep, plane of torment, any mm zone hate them all, karanas in general due to being way too big. I remember walking for an hour to cross them a little too long for me.
For me it would be Fear followed closely by CT. Fear just because.........well anyone who's been there knows. CT because I hated trying to clear up the pyramids post update and getting so many pathers.
Other zones I dislike would be......Kedge, don't like water zones much but ones that are crazy mazes as well mess with my mind. Being killed in the Hive a lot when doing the explore mission pi**ed me off no end but otherwise a very cool zone.
I try and appreciate each zone for what it is, and there is always something cool you may not know about them.
Please no more remodels of a town unless the basic lay out is left alone. IT is a super pain getting around freeport now!
I would say DAgs cauldron. I remember the old days with no maps that ozne was so easy to get lost in. Also other then traveling to unrest or kedge it is pretty much worthless in every way.