Copying my previous comment from Sunday:

Played it all day yesterday. It still has some bugs and if you play co-op you should do it in a separate save file because you can't ever remove your offline friends' characters from your party, but at a mechanical level, the game is a masterpiece.

It's D&D 5e translated with extreme loving detail into a video game. Conversation is nearly as engaging as combat and many of the NPCs have massive dialogue trees, all fully voiced. You can switch between using a controller to directly control your character or using the traditional keyboard and mouse controls like the older Baldurs Gate games.

Hells, the character creator is probably worthy of an award by itself

I'm now 38 hours in and my opinions are basically the same, though I will add that I love how fast they've been patching it. If Larian ever release DLC or expansions for this game I'd expect them to be the best goddamned expansions I've seen in at least the last 10 years.

I'm really hoping it's reasonably moddable because I've little doubt the community would love to mod entire custom campaigns into this engine.