Short-CD Interrupts
Interruptible casts are the main reason keys fail. A party needs enough short interrupts to rotate through trash packs without gaps.
Specs that bring short-cd interrupts
Blood Death Knight
Mind Freeze
Vengeance Demon Hunter
Disrupt
Guardian Druid
Skull Bash
Brewmaster Monk
Spear Hand Strike
Protection Paladin
Rebuke
Protection Warrior
Pummel
Restoration Druid
Skull Bash
Mistweaver Monk
Spear Hand Strike
Holy Paladin
Rebuke
Restoration Shaman
Wind Shear
Frost Death Knight
Mind Freeze
Unholy Death Knight
Mind Freeze
Devourer Demon Hunter
Disrupt
Havoc Demon Hunter
Disrupt
Feral Druid
Skull Bash
Survival Hunter
Muzzle
Windwalker Monk
Spear Hand Strike
Retribution Paladin
Rebuke
Assassination Rogue
Kick
Outlaw Rogue
Kick
Subtlety Rogue
Kick
Enhancement Shaman
Wind Shear
Arms Warrior
Pummel
Fury Warrior
Pummel
Balance Druid
Skull Bash
Beast Mastery Hunter
Muzzle
Marksmanship Hunter
Muzzle
Elemental Shaman
Wind Shear