Watching cut scenes, I agree to let people watch them. Not taking 5 minutes to research boss mechanics makes you look like an ass when you "go in blindly" and become the cause of repeated wipes and wasting other peoples time, not to mention the repair costs.

Reading up on boss mechanics doesn't spoil the encounter, however, not reacting appropriately when you need to because you don't know what is going on is sure to make the rest of the group dispise you.

Take initiative, know your role, and do your part. No one wants to carry you through on their backs.