Entangling Shot / Chain Gang: the hatred generator and a spammable snare on 4 targets. Beautiful synergy with Cull the Weak, and should be effective at keeping enemies away for Steady Aim.
Multishot / Fire at Will: the primary AoE hatred spender. Patch 16 buffed the damage to 165% while making it cost 40 hatred, so Fire at Will is more important now. It should do decent damage combined with Cull the Weak and Steady Aim passives.
Rapid Fire / Withering Fire: the primary single target ability. Huge damage, and I like the look of Withering Fire to stay hatred-efficient, due to Multishot now using up more hatred.
Vault / Rattling Roll: an excellent way to gtfo and survive.
Marked for Death / Contagion: always useful, either on a single target or to take out groups.
Shadow Power / Gloom: excellent for survivability in Inferno, reducing all damage and healing. Cast it then use Rapid Fire on a single target, or spam Multishot against a wall of enemies, for the most effective healing.
Cull the Weak is perfect with Entangling Shot, as you will always be able to spam snares.
Steady Aim is a huge damage increase, and I think it's possible to have it active for most of the time because of Entangling Shot and Vault.
Vengeance looks like a good third passive for this build. None of these abilities have cooldowns, so the only thing stopping you from spamming is your Hatred and Discipline, and Vengeance will help to replenish these. It could be changed for something else though.
I think Marked for Death looks like a really useful ability, but it could probably be swapped out for an ability with more CC (such as Caltrops) depending on if it's needed in higher difficulties.
Edited by silent.knife.speaks., 10 April 2012 - 12:52 PM.