To be frank I see little point in having good ones like Yvonne Strahovski (Mass Effect) for instance as the rpg element in this game is minimal
I do agree that Bethseda could have splashed out a bit more though onvoice acting for (a) a bit more variety, (b) a bit less Eurotrash accents, and (c) improve the quality of input to the game in this area
I have become decent at recognizing voice actors throughout video games and movies and shows and such... Which has led me to the discovery that I hate recognizing the voice. I hate breaking the character because they're suddenly a dozen other characters in my mind.
On that note, instead of paying loads to big name actors for iconic voices, get a bunch of no names who have fitting voices for as many roles as possible.