So, incidentally, I chalk up the Mournhold voices up to pure crappy design and laziness too. Isn't it funny how that works?
I thought that we agreed that they made generic voices because of the fact that all Dunmer share the same voice/body model etc. In Oblivion, however, it's much, much worse, because the diversity was reduced.
I would like the Dunmer to sound different from the other races, but I'd still like them to sound like they're related to the other mer, because it makes the most sense to me that that's how they would sound outside of Vvardenfell.
They sounded the same as the Altmer. Again - lack of uniqueness and diversity.
I still think that it's because of the voice-overed dialogue. As you said, they didn't even want to bother with different voices in Mournhold, not to mention tons of new voice-overed dialogue that would need to be recorded for different races. I call that a design flaw.
In Mass Effect (1/2) various characters had different voices and they really felt more unique than Oblivion's one. All dialogues were voice-overed and it suited the game. In Oblivion, they weren't able to achieve the same effect. Characters were still bland when compared to other cRPGs and both the number of topics available and the voice diversity were reduced. Design flaw.
I also hated the fact that they used the same actors in Fallout 3. Come on, that was just cheap.