For me the issue is the lack of true motive and substance in-between.
As far as the good path goes, the party's motivation in getting answers and becoming purified aligns with other NPCs along the way, so everything falls in place and feels cohesive.
As far as the evil path goes though, there's no true motive nor meaningful reward behind the decision to join Minthara, in fact it feels contradictory to the whole purpose of the journey so it ends up feeling as just; "Hey, you have a choice to be evil here. Feel free to take it if you want". Especially because Halsin is right there in the cages holding all the answers and a possibility of a cure, so why are we suddenly going against our very purpose when we haven't established yet the potential gain from the Absolute's side.
In order to make the evil path have substance, it needs to establish a proper motive and goal for our party. Whether that is more answers and true insight from a real follower of the Absolute, deeper infiltration into the Absolute circle, the possibility to join the Absolute willingly, a quicker and safer way to Moonrise or even power itself. It needs something that weighs against the original motive of the party and it needs to be just as rewarding as the good path. But I don't know if we will get that in Early Access.
For me the only true reward for an evil path would be getting Minthara as a true companion with full romance, as compensation for Wyll leaving. I found her romance to be very sweet, especially with her wishing to take us as a consort to Menzoberranzan and belonging to each other for eternity. That to me would be the only meaningful reward for the evil path, but it still lacks true motive.
