I really liked depths of darkhollow, with the sets of 5 tasks that unlocked more areas etc.. finally getting that lvl 68 spell for each class was awesome at the time. also the random chance for unique items like the shrink earring was nice.  I can't really tell if that is nostalgia talking or it was actually good content. Those tasks were my first attempt at boxing effectively so most likely nostalgia.

also im a fan for climbing towers. like Tower of Rot, pillars of alra, Gyrospire etc..

maybe these are just markers for masochism.