Here is a hypothetical scenario to illustrate the near indestructible state of our beloved warlock class in MOP (though they are
NOT overpowered since all classes will be getting their buffs as well):
Note: All this is assuming the worst possible scenario of being damaged to the bone without much chance of retaliation.
A
Shadow Priest or
Death Knight or
Holy Paladin or
Monk or
Affliction Warlock meets a Warlock (with the following specs):
1) Warlock casts
Twilight Ward to absorb Holy and Shadow damage. Shield gets destroyed by a powerful spell or two.
2) Warlock gets stunned/feared/horrified etc. but uses
Voidwalker Sacrifice to create a shield to absorb more shadow damage while being CCed.
3) Shield breaks. Warlock summons 2nd Voidwalker using
Grimoire of Service and casts a second
Voidwalker Sacrifice shield.
4) 2nd Voidwalker shield breaks. Warlock uses
Sacrificial Pact to summon ANOTHER even more powerful shield.
5) Shield breaks again. By then,
Twilight Ward is ready and is cast to absorb more Shadow and Holy damage.
6) Shield breaks once more.
Archimonde's Vengence is activated and enemy takes 30% of all damage dealt to Warlock.
7) Demonology Warlock uses
Metamorphosis (Demonology only) to get a 600% armor buff and -6% critical chance for physical attacks, effectively reducing all physical damage by around 50%.
8) Warlock is down to 50% HP, but casts
Dark Regeneration to regain 50% HP (55% with Fel Armor on).
9) Warlock's HP still goes down, but casts
Mortal Coil to instantly regenerate 25% HP.
10) Not enough health? Warlock uses
Blood Fear and then uses
Soul Burn + Drain life (Affliction only) to drain 24% (26.4% with Fel Armor) over 3 seconds.
11) Still need HP? Pop a
Healthstone (which is 3 charges now) with the Glyph of Healthstone on. Add a
combat portion into the equation.
12) Have the Glyph of Felhunter on? Good job. All this while, your
Devour Magic was healing you and your pet for X amount of HP every 8 seconds using the 4 buffs on the enemy.
13) Oh wait, I forgot about the 10
Burning Embers (
Destruction only). Tap for instant 25% HP heal!*
14) Still need more HP? Fear target and
bandage.
15) Uh oh, enemy is still damaging you? Using
Unending Resolve and reduce all HP dealt to you by 50% for 12 seconds.
16)
Twilight Armor, Voidwalker Sacrifice, Sacrificial Pact are all up again. Rinse and repeat.
17) Finally decided to give up? About time. Cast a glyphed
Curse of Exhaustion (Affliction only),
Demonic Circle out using the portal and run away.
18) What? A rogue suddenly ambushes you at the Demonic Circle? No fear, that's what the new
Demonic Portal is for.
19) Now what? 10,000 orcs now surround you.
Hearthstone time!
20) Unknown rogue stunlocks you after you hearthstone to inn and kills you. You wait a while ...
Soulstone time!
Good times are ahead of our beloved warlock class
Time for warlocks to rule again like the Soul Link Felhunter days at lvl 60.
Edit: Added
Burning Embers,
Devour Magic and made a few amendments for Destruction, Affliction and Demonology Warlock scenarios.*