I know a guy from my guild who, despite raiding since the beggining of the expansion, has just yet managed to finish the Sigils quest
I agree with the OP tho. RNG is a good thing in mmos, when it adds to the joy of obtaining an item, and keeps the content going. What fun would it be if every boss dropped all his loot table at once? But when it's just "unlucky guys are worse then the lucky guys, no matter what they do and how skilled they are" it's pretty bullshit. And the fact that you have to do this RNG crap not once, but TWICE in one raid makes it even better.