Alright, so, for anyone wondering what's worth watching:
1. Gopher; general impressions, nicely put together:
https://www.youtube.com/watch?v=94R0Ji39E68
2. Angry Joe; boats and sirens at sea:
https://www.youtube.com/watch?v=lJpWBMH9EtQ&t=872
3. PietSmiet; Skellige open world exploration (in German):
https://www.youtube.com/watch?v=ALGJGDRnHT0
4. ImAnderZEL; Some nice, atmospheric pieces of footage:
https://www.youtube.com/watch?v=F_eRUq1PQPE
And I'm sure Jesse's video, whenever that comes out (he's having rendering problems, apparently), is going to be worth watching as well.
My impressions from the videos; well, they've really nailed the atmosphere, the world looks and feels amazing. Combat seems like fun, although it can look a bit weird in places, but I guess you can't really avoid that without making the mechanics too simplistic. Stormy weather - 10/10, absolutely stunning, from both audio and visual perspective. The amount of lightnings seemed a bit excessive, perhaps, but eh. Sirens at sea - that was fantastic, and seeing that one at the end destroying the boat was great.
I could nitpick over some glitches etc. but I don't know how much has been fixed by now, since that was an older build they were playing on. And the issues that are there are so minor, that they're fairly unimportant. Overall, I have to say, the game's looking preeeeetty strong. Good job, REDs.