I've said it before and I'll say it again:
5 Shaman + 1 Priest Offense
Totally serious. Hear me out.
The potential burst damage is just stupid now, and now that Shock CD's are split from their interrupt, Shamans - if coordinated can completely lock down at least one, probably two healers WHILE just wailing away at the FC. Obviously they would all be Engineers for bomb-throwing; I'm not sure if there's a DR on bomb stun, but even if NOT, the burst-potential of a group of shamans is just stupid (remember the multi-boxing shamans in endgame arenas? same idea - 5 chain lightnings + shocks were hard to counter.)
Oh, also this would be much more efficient horde side, where they could all be Tauren - between war stomps and bombs, I really can't see a way out of the lock. *Oh, and the priest is a Blood Elf for added spell-negation* And all that it requires is for, say, two shamans to catch up to the FC - before the others would be in shock (25 yd range now?)/bomb range as well (hell, even a Mind Blast!)
It's hard to keep a Shaman off his target (while in Ghost Wolf, even Hamstring/WC only drop them too normal run speed, remember) and they have the capability to keep pace with the FC if left unhindered - certainly once Debuff hits, and the priest is dispelling the inevitable Frost Bolts, this should not be too difficult.
In fact, it's even gotten even MORE burst-heavy now with the silly new "Fire Nova" spell or whatever. The Shaman offense could pretty much pull their 'Alpha Strike' into a single chain of commands
-Two cast War Stomp, on a healer and on FC; another does a hair later, in case he tries to trinket (lolol)
-All Earth Shocks are cast (simply make macros of /cast Earth Shock [target=<FC's name>]
-They take turns throwing Big Bronze Bombs
And while waiting:
-Lay a Searing Totem
-Whack him with your club or hell, the initial WS'ing/Bombing shaman could even toss in a Lightning Bolt!
-Activate Fire Asplozions
And the Stomp/Bomb/Healer-Shutout SHOULD hold long enough for a second round of Shocks to go up.
In the above situation, even if only 3 of the Shamans were in range at the time (plus Healer), let's look at an estimate of the damage output:
-4 Bombs (priest should be able to catch up a few seconds later) = 400 damage (more if a couple of them use Heavy Dynamite!)
-6 Earth Shocks (if they manage two rotations: only 6 seconds of spell negation would be required...easy) = 6(64 + .4*(SpellPower)) = Conservatively let's say 625 damage
-3 Fire Novas = Not sure the exact damage, but if it's 3(52 + .3(SP)) = 270 damage
Add in a few melee hits, perhaps a Lighting Bolt or two (it's hard to say how difficult that would be to pull off, under such pressure), a few pings from the Searing Totem, a Mind Blast or a couple wands, and assume slight imperfections in the damage and you get AT LEAST 1,300 damage. Easy.
Oh, and that's not factoring in crit percentages. Too lazy to wade through those numbers. But realize that these shamans would be decked out in Spell Power and Crit gear.
In practice, I think you would usually end up doing much more than this. Even if - big if - a healer breaks breaks free of the chains of wind shears and fears, the best they can do is heal chunks of ~450-500 every 2.5 seconds - hots and shields are useless of course. Over a little time, the damage output will completely overtake this healing - once the burst is over, the offense can simply nuke the remaining life (if there is any...probably not, if debuff is up) with lightning bolts and another wave of shocks.
/crazyrant