Yeah I enjoy the DH class, and it's a pity that the low dps issues that plagued ret paladin in WoD are on DH now. I've run my character through simulationcraft, and with the gear i've got (2 lege, various 860-875 items and trinkets, 890 weapon (850,860,875 relics), I ought to be doing 635k DPS. However, the dps in-game is all over the place - it can drop down to 180k, then suddenly jump up to 400k, maximum i've seen is like 655k -- and this fluctuation seems to happen upon joining and parting groups/raid, moving from one zone/world quest phase of broken isles to another, entering mm+ dungs and then teleporting out at finish or leaving instance. In mm+, consecutively i was able to do a +8 dung with zero problems, dps was 480k, then the following also +8 but different dung i would be getting the boot from group for doing barely 245k. My play style, talents and rotation have been the same in both dungs.
The best way for me to stop this yo-yo effect is by switching talents back and forth, re-equiping weapon and legendaries, throwing myself off the cliff or let myself get killed by mobs; upon respawning my dmg would be back to 550k dps, and so on.
With spells the biggest issues for me seem to be:
1) Nemesis - not only does it not have the after-effect that it should, but upon expiry it would reduce overall dps output to below the level it was before it was cast, the more it's being cast the worse the dmg
2) Chaos burn - at say trait 46 we ought to be doing 10% more overall dmg, which isn't happening because it's been disabled (i understand disabling it for pvp, but not pve)
3) Demon Blades - this has a miss rate of 75%, dropping overall dps to 100k once it starts missing 5 times in a row.
4) Chaos strike has stopped dealing the dmg it should due to crit stat being depreciated, relics and chaos burn do very little to help
It seems like a fair bit to do, but i can remember some of the mentioned spells used to work a number of months ago