I decided to make this thread because I am certain there are a few dungeons out there that people cannot stand. I have gone through probably all the variants, and I have a few mixed feelings for some, enjoyed others while despising the rest. Be it a bad group experience tainting my feelings to it, a certain mechanic to a boss or just how the place looks.
My most despised dungeon would be one of the Argonian Dungeon Content Pack Dungeons, primarily the one where you go down tunnels and fight an assortment of spider-themed bosses and such. The dungeon looked fairly atmospheric, although the mechanics on some bosses can be a pain. What sealed the deal for me is when I was with my group on the second-to-last-boss and as a tank, and the boss had this mechanic that got me pinned and the adds needed to be intereupted to get me free... What did my group do? Either attack the boss or the adds, until I died and the group wiped and repeat.
Telling them a hundred times that the adds needed to be interrupted, until I essentially gave up and left the dungeon.