And you know what I never understood? Does anyone remember watching this early Oblivion gameplay Demo with Todd's commentary?
http://www.youtube.com/watch?v=9prOJj_ChLc&feature=related
Notice how around 0:50 the Dark elf has the proper voice! What was with that? Why didn't they use this in Oblivion? It seemed like the Dunmer were supposed to have their real voices in Oblivion, but didn't for whatever reason.