This is what I go with.
I have no idea how viable (or not) the spec would be in any other situation, but I personally use in 3s. Where we go Warrior/Rogue/Priest.
The idea is to get a premed-cheapshot into a 5 point imp EA as fast as possible and auto-gimp one of their dps. My dps is a lot weaker then it is in combat, but it doesn't really matter, since this spec is all about taking advantage of the arms warrior's disgusting burst (even more so when paired with imp EA and Hemo). Seal Fate/Hemo means fast combo point, so I can KS with ease... once he gets in Dirty Deed range, I do a 5 point Cold Blood Evis which take him into Execute range and wham, good night, thank you mam.
The warrior is a wrecking ball, I'm the guy who paints the X on the wall. It works pretty good.