Last night, my guild killed Fallen Avatar (Heroic), making us 8/9 for Tomb of Sargeras. Now we only have Kil'jaeden left. That's decent timing, and we should get him down before the next raid opens.
We actually had several close wipes on Fallen Avatar. 3% last week, and a 1% and 0% wipe this week. Sometimes my guild makes strategy over-complex. For example, here we were "sacrificing" people in the last phase to the Dark Marks, but that killed our DPS and we didn't have enough to push it over. For the kill attempt, we didn't try to sacrifice anyone, and just healed as much as possible.
The other problem, I think, is that we aren't very predictable in positioning. Like for Fallen Avatar Phase 1, I would imagine that people should try and stand in a given spot, and move in similar ways to the last attempt. But it seems like every attempt the movement of players is different from the last attempt, forcing everyone to adjust on the fly.
But then again, I've always liked assigned positioning and choreographed movement. The problem, of course, is that if you have to deviate a lot from the choreography, than you might as well not bother.
Still, I think that predictable player movement is an underrated element for normal/heroic raid groups. Mythic groups often move predictably naturally, and so rarely call it out as something to work on.
Still, a dead boss is a dead boss. On to Kil'jaeden!