I like Mistweaver the most.
Not the most straightforward healer in game, but his mobility is fun even when you are trained by multiple melees. All other Healers, but Druids, are mostly sitting ducks. Healing is fun when you are not focused, but if enemies realize you keep your whole team alive and start to focus you, it is the least fun I ever had in game.
"There is a pervasive myth that making content hard will induce players to rise to the occasion. We find the opposite. " -- Ghostcrawler
"The bit about hardcore players not always caring about the long term interests of the game is spot on." -- Ghostcrawler
"Do you want a game with no casuals so about 500 players?"