Ever since I popped FO3 back in I've lost all interest in NV, DM and HH were letdowns for me, and there isn't much to get me excited about these upcoming two dlc's
id have to say i agree a lot with this statement, there was just more to do in FO3.
as for OWB i really dont care, im expecting it to end up kind of like MSZ. im still getting it on the release day though, i am interested to see if there ill be anything to do in the big empty after you beat the main quest or if it will be a let down like HH (im talking about repeatable tasks, or mini game kind of things) personaly i hope they bring back the ability to be a slaver since the bomb collars were made there