Vanilla: Razorfen Downs
I just hated the aesthetic, and the sounds the quill boars make when they die just grates my nerves.
Burning Crusade: All of the Auchindoun Dungeons
I really hated them, especially the Arrakoa one. We had to run those SO many times. I got so sick of it, and looking at the walls of a Draenei ship texture for hours and hours and days and days really wore thin.
Wrath of the Lich King: Oculus
I still hate it. There is a reason everyone in a pug jumps ship as soon as they see Oculus queue up. Having to explain to people how the dragon fight at the end works is not worth the ridiculous grind to get to the end. It’s a nightmare from start to finish unless you’re with a group on comms who knows what’s going on.
Cataclysm: Grim Batol
Pugging that one was a nightmare. It was okay in guild groups, but it was always one I wanted to just have done with.
Mists of Pandaria
I actually enjoyed every dungeon in Panda Land.
(I did not play when Warlords of Draenor or Legion were current)
Battle for Azeroth: Tol Dagor
Screw that dungeon with its pass-through walls and low ceilings. I hate it. I hate it with the fiery heat of a thousand suns.