What I mean is that prior to the underdark you at least have some sort of character interactions going on even on the evil path. Astarion, Lae'zel and Shadowheart would at least make your comments here and there and during dialogues or just on the path asking each other questions etc. I went through almost the entire Underdark and Grymforge, and they just aren't talking.
But, good playthrough, they're making comments about things all the time. "I like the way this guy thinks. It's a bit genocidal, but effective.". Stuff like that.
Evil path? Eerily silent. It's like they don't want to speak for fear my MC might kill them. It's just a bit... Weird.
