I currently have 2 weapons for tanking: My beautiful axe, Grom'tors Charge, and Terroks Mace. The mace has a Weapon Chain. Following a bad experience in the Ramparts with Disarming Orcs, I always keep a weapon chain ready.
Am I better off with a Weapon Chain or an Enchant on my regular tanking weapon? What proportion of Kara / Heroic Mobs can disarm? Are there any Instances where a chain is essential or even un-neccessary?