This is how I am running Dark Ranger. It is in the in-game builder under Wrath of the Dark Ranger.
The premise is to use Black Arrow to:
Increase hunter abilities by 8% and Shadow abilities by 8% with Shadow Arrow and increase all damage you do by 12% more with Point of No Escape talented and enchants. To do this we have to greatly reduce the cooldown by having Resourcefulness talented and enchanted and to have 1 Hasty Black Arrow to make it down to a 12 second cooldown.
Insect Swarm is used to increase nature damage normally but with Wrath of the Plague it will now also increase shadow damage by 9% too.
Wild Wrath is used to keep Insect Swarm up and to reset the cooldown on Chimera Shot. Chimera Shot - Serpent Sting will be the second most damaging ability in the build following Blood Arrow from Dark Ranger.
I only use the Blood Arrow and Shadow Arrow features of Dark Ranger and do not use Nightfall, Dark Arrows or Shadow Artillery because there is no room in the rotation and having to build up to an AoE doesn't work well in dungeons.
Ferocious Inspiration is more for the 3% boost to everyone's damage than the steady shot increase.
Curse of the Element and Shadow Arrow are Warlock Affliction abilities and will help Blood Arrow with the Soul Siphon Talent.
Ranged Speed talents are to make sure everything fits in the rotation, there is no haste gear needed.
For trash mobs, Frenzy shot and Volley are used. Wolf pet does not have Bite or Growl on it, only Furious Howl on cooldown and Call of the Wild on demand.
For boss fights:
Hunter's Mark, Curse of the Elements, Black Arrow, Insect Swarm, Serpent Sting then two steady shots so that Wild Wrath it is primed for the 3rd stack.
The sequence can then a macro can be used for the repeating sequence that will keep Black Arrow, Insect Swarm and Serpent Sting going constantly.
/castsequence reset=combat/5 Blood Arrow, Chimera Shot, Wrath, Chimera Shot, Blood Arrow, Shadow Arrow, Blood Arrow, Steady Shot, Black Arrow
This keeps high uptime on Shadow Arrow and Blood Arrow and the two Chimera Shots and Steady Shot makes for the 3 stacks of Wild Wrath.
At ilvl 120, I am doing 6.5K DPS with the build. Let me know what you think or if you do Dark Ranger differently.