Wouldn't it be more immersive if demons, such as Diablo, azmodan, belial etc didn't speak english, but rather some made up demonic tongue, perhaps similar to latin or Aramaic, and put subtitles in english so the player knows what they are saying? Or better yet, if demons not only didn't speak english, but didn't understand the notion of sarcasm and insults, mock us in our own language with perfect grammar, in holographic appearances to the player? But seriously - I am all for Blizzard making demons actually scary and immersive, rather than making them childish school-yard bullies who are so overly personified that I could imagine them waking up early with an alarm clock and rushing to work in traffic. More mysterious, non-human etc. Angels too.