Datto did a great video a while back on raiding in destiny.
It's long at 20 minutes but it will give those who have no idea what raiding is a little perspective.
Think about trying to pull those bosses off with a group of people who don't listen and can't learn rolls...
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Quite frankly, the dude in video even admits he ain't got a clue about how raids will be in Destiny. To those who use some MMO's raids as the base of their argument against MM in Destiny's raids are just guessing.