I was pleasantly surprised by the few hours I got to try it out, and have only grown more and more excited about it because of that. That video, on the other hand, didn't do much for me. I like the ideas they presented, in general, but the encounters seemed a bit too easy for my liking. I'll have to see how it is first-hand (hopefully soonish).
Maybe they were just showing like a group quest boss or something not like actual group dungeon content... those group quest bosses are always pushover's.
This video shows a dark anchor fight. There are a couple of spots on the map where dark anchors come down from time to time as shown in the video. Its not a cutscene either, and you can actually see it from very far away. Its a public quest type thing.