Jahmilli the R1 mage in the world right now won't even fight demo locks because they are so strong, go watch last weeks king of the hill on AJ.
Reckful, Vanguards and just about every other top player will tell you Demo lock is the #1 spec in the game right now in competitive arena.
Its not really any surprise, AoE is basically handicapping anyone you fight against by 30ilvl.