Yes, this is why people that saw "Raiders of the Lost Ark" when it came out all were disappointed. They were too reminded of Star Wars when they saw Harrison Ford and heard his voice. Millions of people couldn't understand why Han Solo was running around fighting nazis. The fans' confusion was so profound, both of the movie franchises failed. To this day, Harrison Ford is confused with a smuggler that has a big walking carpet as best friend and co-pilot, by rational intelligent and reasonable people, when he walks down the street
A very good point. There are actually two lines of thought that need to be considered.
Firstly, the argument against casting actors who have worked in previous games is illogical, for the reasons that Halthor has pointed out. If you were to follow the argument through to its conclusion, an actor would only ever be able to play
one character in any kind of media (film, TV, radio, video game, etc) and never play a different role again. He could only ever be re-employed if he was called on to reprise that same role. It would make acting a very poor choice of career, wouldn't it? Fortunately though, the world is not insane and accepts the fact that actors will reappear playing different roles.
Secondly, with mediums that require voice work only (ie, the person is not seen), an actor has the advantage of providing a different voice to hide the fact that he is doubling roles. Unfortunately however, lots of actors cannot do this successfully and can only do one default voice (ie, their own) and this can be jarring to the listener.
So to sum up my view - it is fine if the actor can alter his voice when playing multiple characters within the same game, but this does not happen enough in
Skyrim, or the other Bethesda games, for that matter. How many times have you come across a character with Ralof's voice, for example? The big name actors who are recognised by the public, such as Christopher Plummer, Max von Sydow, Joan Allen and Michael Hogan etc, should (and do) only play one character, but the supporting players who double, triple and even quadruple their roles really should use different voices.
Stannie