Pretty much this.
Just no, there is no way you are doing 50 k hits on a full resi twink.
Two main reasons :
1. Barely any level 80 has over 40 k hp, so what you are telling me is that you manage to one shot people ? You are actually that overpowered ? i mean even a frost mages with 37 % mastery needs to at least two shot people. But no, you as destro manage to literally 1 hit people. I will believe this when i see it happening on myself or the day you bring us some proper logs of you hitting 50 k on a 1.4 ish resi geared healer and 1 shotting him.
2. You self claimed your self to have " best in slot " gear, nonetheless i see you using items such as Nevermelting Ice Crystal. Reign of the Dead ( normal ). These are just two examples, i would also like to point out how you lack pretty much every single possible enchant. But hey if i 1 hitted people without enchants i would not bother getting them as well.
So just to end it being the kindest i can, please, if you actually have no bloody idea of what you are talking about and you just made an account to fuorviate new players wanting to join the bracket you might as well get back to 1 hitting people in battlegrounds and leave these sort of threads where you obviously have nothing relevant to do.
Now getting back to the initial topic, i do believe affliction warlocks are good if well geared and i would say that in 2's you can be competitive with a proper healer ( i would suggest priest or either resto druid and shaman ).
I do however have no clue on warlocks as i have never played one myself but from the few i saw in battlegrounds ( I think one might be from legacy or Lnsanity ? ) they are extremely good with a very good and sustained damage.
Hope this helps, again, do not take my words for gold as mine is just an impression given to me by fighting a couple of good warlocks in 2's and watching a few perform very well.
Edit :
They are indeed and the changes look at least interesting.