Yep you are really lost. I want something to work as intended, and because of that I'm sad since you still have nightmares from dks. Yep. You are really missing a few screws there mate.
Lemme see. 4 dks in top50 in 2s. Took me exactly 2 seconds. You have around 10 of them in 3s, but you also have several classes that are much, much more dominant there. And yes I'm talking about Warmane, since we are not on retail. Shocking...
And a biiiig nope. Best tank is protadin(or maybe bear feral depending on the fight), best pve dps is fire/fury/combat(depending on who you ask). Dks barely crack top10 dps. Best in 1v1 pvp is ret pala with LoS, bauble and corroded. So not the usual circumstances.
You really cant' seem to realize we are not speaking of anything before 3.3.5 do you? Nobody cares about S5/6/7. We are playing S8 you nonce. TSG is dominant thanks to warriors. And not only because they are MS bots, but because the ****ing UA with insane mobility and burst damage is the thing that is making warriors surprisingly powerful against casters.
I dunno. Only spec that really has no business in area are holy priest and fury warr. Blood, survival and demo can work to lets say 2k if you know what you are doing. All the other specs work just fine, counter and are countered by certain comps.
The fact that dk rape train didn't stop when you started crying seems to be your problem...