State of Druid(Feral),Rogue,Warlock?

[ItsWrathful]

So i geared my mage to full and i want to level and gear up a new character.

I would like to know these things about these classes/specs:
-Feral/Balance Druid
-Combat/Sub Rogue
-Destruction/Affliction Warlock

1.Bugs of the class?
2.Is the class playable/op?
3.small description of the class

(OFF TOPIC)
if you can please say whats the best spec of each class for leveling is and how fast it is:)

Thank you
For your opinions:)

[ItsWrathful]

Bumping guys pls answer:)