First few attempts:
We were trying to CC everything as much as possible... We killed nothing
We tried to kill pets first.... we killed nothing
We were stacked in close together... we killed nothing
Last few attempts:
We laxed off CC and focused dps more on one target... we killed one
We spread out... Lived longer and killed one
We locked down the druid with one person!... we killed one
Vordin has been on a successful 5v5 team and their first order of buisness in any match was either to focus all dps on the healer, or lock down the healer and focus all dps on another dps. Since we have multiple healers, lock em and burn one. When we tried this way we were successful in killing one and almost 2!
Lead and Faeodan have done this fight successfully before... their ideas should be taken into concideration and tried. If I've never downed a boss and I go in with someone who has... Im doing what the guy who has killed em says to do...

I know we're bouncing ideas around on here which is awesome
but lets not cut our nose to spite our face...
I also agree with Faeo on the aspect that this fight can only be planned so far ahead... Arena fighting isn't something thats routine or plotted... there's a reason why everyone needs to be on vent to call things out because even though you may know how to tend to an opposing class... you dont know whose the weakest played or the one whose going to cause the most trouble! This fight is about thinking fast, communication on vent, and observation during the fight.
Mostly this fight is about survival and to each their own. I agree also that ppl need to use their own spells to save their own ass. Shackle, Blink, Roots, Traps, Stuns, Banish, anything thats available to you when something comes running at you. Keeping yourself alive is most important! The npcs seem to have a short attention span so you just need to do this long enough till they find someone else to pick on.
I have no opinion on which one goes down first. I do want to support what has been working for us and what hasn't been working. When we lightened up on CC and focussed dps... we made progress.
Its just going to take practice as this fight is out of realm for most ppl who dont do arenas or have familiarity with PVP. And Im rusty as hell! lol
~Verty aka Kitty~