Their burst is faster than your DoTs - Fear the Rogue the instant he engages, and have the Warrior peel rather than chase.
Two healers can outheal your DoT damage - Curse of Tongues one healer to reduce their output before committing a full push.
Similar shell matchup - whoever lands Fear/CC first on the enemy healer usually wins the extended trade.
A slow DoT race - whoever Fears the enemy Warlock first usually builds the damage lead that decides this long fight.