Personally i find it annoying when playing games and watching movies that everyone human or otherwise speaks with an American accent. So bring on the variety as long as it suits the story, period or setting of the game.
BTW The characters aren't speaking "Old English", everything from Shakespeare on is considered "Modern English". Old English refers to Anglo-Saxon English prior to Norman influence, which was c450-c1150. Old English would be almost completely incomprehensible.







