Honestly, I think orcs and trolls are both better than blood elves as casters, at least from a PvE perspective. I mean, the silence thing is kinda nice, but trolls can get an on command haste buff and orcs get both stun resistance, increased pet damage and Blood Fury, which is good for a 143 spell power for 15 seconds at 70, which is pretty nifty for warlocks. I just can't stand how non-taurens look, mostly. I play male characters and they all run around slouching like idiots.