Played and completed all of them, except SoU. At the time, my computer just couldn't handle some of the special effects going on and I found it to be a frustrating experience - so never did complete that one.
Did the NWN OC and HoU several times though. Several times both singleplayer and multiplayer with the OC.
I tend to enjoy a good singleplayer and small LAN-style game, so I've tried (and completed) numerous modules over the years as well - by myself and with friends.