The Warlock was my main and has epic weps and about 3 pieces of mav level gear. But warlocks seem to be changed every week so not sure about that.
I mainly wanted to know if in your guys experience its worth sticking with my lock due to the gear advantage despite demo being screwed and destro being pretty easy to counter in terms of reliance on chaos bolt!
Spriests probably require the most effort to be effective, but just watching Talbadar's steam has helped me see their potential. Warlocks are still in a pretty good place, but if you're not comfortable with any of the specs, I wouldn't recommend it.
My Holy paladin was very easy to pick up and seems very potent. Likewise, it's pretty hard to go wrong with Arms.
You my good sir have definitely not seen a good Demo in arenas or Destro in RBG's.
Actually I am watching a pretty decent lock on a daily basis. First person perspective :-)
I also see other good locks constantly. And I see how badly they do (in relation to how well far inferior players do on their warriors, mages or rshams etc.)
Destro has its purpose in RBG's I will admit that, very gimmicky and unsatisfying though. Underwhelming in arena as well. Both destro and demo after the nerfs are not quite as bad as affliction is but it's getting there. Out of the 4 choices the OP proposed warlock is BY FAR the worst choice this season.