Now about 20 hours into our 4-player playthrough of Divinity: Original Sin 2. So far, I'm impressed. The world is very fleshed out, the characters and interaction is neat, and the multiplayer aspect works really smoothly. A little indecisive on the plot so far, as it seems kinda ambiguous or fuzzy, but that could be because we're spread apart doing stuff individually and then reporting back.
The combat mechanics are a little different from DOS 1, but I think it's a change for the better. You get fewer action points per turn, and physical/magical armors can block some status effects, so combat tends to be longer and actually meaningful rather than just burning down the enemies in like one turn.