Simply getting people to follow instructions. I completed it with a group of friends which wasn't too bad, despite us all being egotistical bastards. I've walked 3 random PUGs through the raid now as well. The simplicity of following instructions is difficult for people, or perhaps their lack of skill in doing certain tasks.
TL;DR - communication.
[b][i][u]Edit:[/u][/i][/b] Also the terrible glitches. Those were terrible. Terrible.
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Have to agree with you I had to kick people out till I found some that would do what they were told.