Nek Castle is the devil. It is the worse experience I have had with a multi-box group. I led my three toons through the zone yesterday with some help from guildies, and had to manually manuever all three up every flight of stairs. I felt bad each time everyone had to wait while I selfishly took the time to move everyone around. I even sentenced group members to die while I was busy with my little army.
I will not be returning for the Missing Mask HQ, although I did pick it up… Running the zone at level 40 netted me almost two full adventure levels and a couple AAs.