This is a fine compromise. I'd add to it that cutscenes should be locked for players who have already completed it so as to avoid trolling and the unnecessary replaying of things that have already been seen.

I try not to be a jerk about it for new players, but in 3 groups last night for Praetorium and CM, there were 7 of us ready to go and 1 person not ready, so we 7 man'd everything. It's not the nicest thing in the world, but neither his holding up 7 other players. In Praetorium, we were able to kill 2 different bosses in the time it took the person to watch their pre-boss movies. That's excessive.