Spader, who has starred in various roles over the years including Boston Legal and Stargate is typically a comedic performer (though he was nominated for a Screen Actors Guild Award for Lincoln last year) who just happens to be a friend of Robert Downey Jr's.
Needless to say, it's expected that he will be voicing the character more so than being the physical representation.
Curiosity speaks to one factor about that, though: if the rumors and speculation all ends up being true, that J.A.R.V.I.S. is the source of Ultron for this film, why is Paul Bettany not voicing Ultron?
What do you think of this casting choice? Are you more excited about the film or more worried now?