I vaguely recall them saying there were like over 70+ Voice Actors for Skyrim in an article but I could be wrong, does anyone remember Bethesda mentioning it?
Every Dark Elf guard in Morrowind sounded the same and all had the same phrases, yet it was never a problem, probably because they didn't talk much.
They did get 70+ voice actors, but they were dumb enough to only use about 10 of them for all the general voices, think it was 1 or 2 per race and the same for imperials and bretons with some other deviations
The thing is that they totally missed the point when people complained about the lack of voice actors in Oblivion.