There's a problem on both ends.

1) All new players who do these missions via Duty Finder should understand that this means they are subject to potential speed runners and/or people who don't care to wait on them to watch cutscenes. If they wanted to do the runs and watch cutscenes, they could have created a Party Finder or had someone help them create one. There's an option specific to Party Finder, which has been added for people who want to watch cutscenes and enjoy the fights at a slower pace.

2) Older players and veterans should make more sensible and understanding choices when it comes to running these dungeons with completely new people. At least be courteous in explaining to them that they can watch the cutscenes later -- understand that it's their first time too. A lot of players who are vets now were new players back then; those who wanted to watch cutscenes and enjoy the "feel" (or "moment") of the final two dungeons for 2.0.

I've seen players flat out call other players idiots for not skipping cutscenes and rushing through the content, without having a second thought. These same uncaring people won't even take out the time to explain what's going on in the same dungeon as well.

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As a tank, I make it a point to allow anyone to view cutscenes, but I let them know that we will burn through most of the content quickly, so to them it will be one large on-going cutscene. All of Prae and CM can be completed with 1 good tank, 1 good healer and about 3 DPS. That includes the tank grabbing all of the adds on each boss. So essentially up to three others could be completely new and watch cutscenes while everyone else kills everything.