My top three features in this game:
1. The maps. Holy shit are they just fantastic. There's a little more room for improvement (a few secrets only reachable by long distance teleport/flight), but not a lot. Can't wait to get the map editor to play around with.
2. The body language of all the characters. Massive feature, but being able to see it on all the characters is so fantastic, makes everything and everyone feel so real. I especially loved meeting Jaheira's family.
3. I'm torn here, so many things I could list, but I'm going with the long rests. They aren't perfect, since it's easy to get an overabundance of resources for them, but it's such a nice pacing tool that I'm annoyed more games don't have them. They would be a tad better if you had to delay them a little more, more often, to have some more challenging stretches where you have to ration your resources. And if there was at least a small chance of running out of food, but I think you can do the game twice over just with the loads of alcohol you can find. Even with those shortcomings, still one of my favorite three things about this game.
So tempted to just keep going with "4. Throwing people in more ways than I can count." =D