My gosh mage is fun, specifically FIRE mage.  I loved playing frost of course, very much so, but just the spells and the burning is just the absolute tits.  I’m stealing mobs bubble shields, stealing other mages combustion (shouldn’t be allowed let’s be honest), frost shields, interrupting healers (and GOD DAMN WARLOCKS just ‘cuz!!), and hurling flaming enormous boulders of pure ouchyness at people.  It’s flipping GLORIOUS.  Plus setting Horde on fire is FANTASTIC.