Baseline Inquisition for ret pallies. God damn that made the spec awful. That or Rune of Power for mages in MoP. The class was great fun until 90 when you got that stupid ability. Then fun time was over. You will stand in this dumb circle or you will not be doing full damage!
I guess just any arbitrary “keep this buff up to stay at 100%” ability. It’s not fun. The latest one being enhancement shamans’ weapon abilities. There’s no choice about what buffs to use or which weapons to use them on! Just make them passive, you dorks!