Search on youtube: Shadow priest legion. Darkheart Thicket Mythic |+8| (won't let me post links)
Ilv of group around 860-870.
Mage + DH repeatedly doing 1mil+ DPS on 4 target(up to 2 mil on 5-6+ targets) whilst we will be stuck on 200k dps weaving dots. When you said that mythic+ will fix things because mobs will have more HP, well try again. This is mythic8, 2 less than the highest difficulty that would give you gear and yet we are still a complete joke (in that video tank did more overall dmg than the priest).
True on boss fights we seem to be ok but we only beat the other less geared specs by 10-20k dps which is like what, 5% more dps, when they have literally 500%-1000% more dps on trash. Absolutely pathetic that people still argue that things are ok, especially when dungeons can be used as an alternative gearing route.