With DnD clear distinction between good and bad, it will be tricky to make believable Evil path. Good evil path would require sympathy and understanding, and not making good path an obvious, better for everyone choice. THat would lead to a lot of grey, ala. Obsidian, which while I personally prefer, I dont think it would be a good fit for DnD and Baldur's Gate IP.
Wouldn't that actually make it more Neutral than Evil?
Also, I think that an Evil path can be interesting and believable without being grey.