It is not entirely satisfying listening to wither Alex or Garona. Garona has always been protrayed as a lithe, agile and generally 'fragile' compared to the normal Orc female. Her voice makrs her as even more rough than the NPCs. It makes Medivh's little dabble seems rather... fetish'ish (his only known 'encounter' is with a woman that is more male than he ever was and sounds like it as well). The quality isn't terribly impressive either. The voice is devoid of emotion and direction. Sort of similar to the new voice of Sylvanas.
Alexstrasza, again the voice isn't fitting with her as such. She represents herself as a Belf/Helf at her best, but sounds like te age she really is. It makes for wondering about her own ability to see her age and try to fight it. :P But when I think back on all the other dragons we have faced, most of them have timeless or young voices. This is most apparent with Malygos. Deathwing is slightly different since he isn't physically the same anymore, but even he has a voice that sounds more ragged than old. I wonder if her model will now be hunched over with a walkingstick.
It's ok with both voices, an argument could be made, but the thing that grates me is that Blizzard ha already made their decision on how they should be represented. This goes against that unfortunately. But, if there is a quest or a dialogues somewhere where it is mentioned that Alexstrasza has suffered from the sundering and the loss of Malygos or some stuff like that, then an older voice isn't bad at all.
I just fear that it is the case of Sylvanas again.