This is a difficulty tier list for warlock 1v1s with every spec in game, including some hybrid specs (listed at the bottom). This is made with dueling knowledge of over 10 years playing WotLK from Retail WoW, Arena Tournament, and Warmane servers. This is made from dueling some of the best players from duelists, duel heros, gladiators, famous players, and random players with over 50,000+ duel wins recorded in my time playing. These duels are played in open field with no line of sight (difficulty of duels can change if line of sight is used).
***Remember difficulty is a matter of opinion not everyone will agree with what is typed here*** (NOTE: You wont see me use demonology spec very much in this list. I do not recommend demonology spec for most 1v1 situations because destruction and affliction are better in most situations, only versus beast mastery hunters do I find demonology the best spec).
It is important to remember that difficulty can change depending on how good your opponent is at playing his class/spec in 1v1.
Hardest Tier:
Unholy Death Knight: As destruction spec
Beast Mastery Hunter: As demonology or destruction spec
Destruction Warlock: As destruction or affliction spec
Shadow Priest: As affliction or destruction spec
Frost Mage (Pet kill strategy): As destruction or affliction spec (Can be Intermediate Tier if they are not good at dueling warlocks)
Hard Tier:
Subtlety Rogue: As destruction spec
Marksmanship Hunter: As destruction spec
Enhancement Shaman: As destruction spec
Feral Druid: As destruction or affliction spec (Can be Intermediate Tier if they are not good at dueling warlocks)
Intermediate Tier:
Frost Death Knight: As destruction spec
Blood Death Knight: As destruction spec
Combat Rogue: As destruction spec
Fire Mage: As affliction or destruction spec (Can be Hard Tier if fire mage gets good RNG with crits and reflects)
Arms Warrior: As destruction spec (Can be Easy Tier if they are not good at dueling warlocks)
Protection Warrior: As destruction spec (Can be Easy Tier if they are not good at dueling warlocks)
Retribution Paladin: As destruction or affliction spec
Holy Paladin (They cant kill you if you know what your doing but killing them can be difficult sometimes): As destruction or affliction spec
Affliction Warlock (Easier to beat if your destruction but can be Hardest Tier if your playing affliction mirror match): As destruction or affliction spec
Easy Tier:
Balance Druid: As destruction or affliction spec
Discipline Priest: As affliction or destruction spec
Survival Hunter: As destruction spec
Arcane Mage: As destruction or affliction spec
Protection Paladin: As destruction or affliction spec
Assassination Rogue: As destruction spec
Elemental Shaman: As destruction or affliction spec
Demonology Warlock: As destruction or affliction spec
Fury Warrior: As destruction spec
Easiest Tier:
Restoration Druid: As affliction or destruction spec
Holy Priest: As affliction or destruction spec
Restoration Shaman: As affliction or destruction spec
Honorable Mention Hybrid Specs:
Beast Mastery/Marksmanship, Readiness and The Beast Within, Hunter (Hardest Tier): As demonology or destruction spec
Shadow/Discipline, Devouring Plague Spam Spec, Priest (Hardest Tier): As affliction spec
Unholy/Blood, Mark of Blood and Scourge Strike, Death Knight (Hard Tier): As destruction spec
Retribution/Protection, Reckoning and Sheath of Light, Paladin (Intermediate Tier): As destruction or affliction spec
Frost/Fire, Elemental Spec, Mage (Intermediate Tier): As affliction or destruction spec
Assassination/Subtlety, Mutilate and Preparation, Rogue (Easy Tier): As destruction spec
-Duelist Ninothezerk/Redcocaine