The short answer is it depends on what other classes you're playing with and what type of PvP you're doing. For example Shaman are good arena healers, and a Blood DK has ridiculous amounts of survivability. Rogues always have a place as an annoying ambusher in BGs at minimum.
Yes, EMFH is powerful at the moment.
. Edited, Apr 18th 2012 2:48pm by someproteinguy
That monster in the mirror, he just might be you. -Grover