The complete lack of the alignment system in the game like we had in older games (like BG 1 & 2, ID 1 & 2, NN 1 & 2) is something I will never really understand. It could just be because back in the days, it was easier to add lot of NPCs with different alignments (or less expensive) than today or because it's a system that can be somewhat confusing to new players, but as already has been pointed out, this way the whole evil side of the game feels empty. There are no characters to join you exclusively beside Minthara, there is no big ending and also, there is no real supporting narrative to it compared to the morally good path.
It's a CRPG, not a bedtime story that should have a morale to it.
There were so many options for evil characters like Nere, Kar'niss, Sazza and such who could be used for this, but maybe it wasn't worth investing time or money. On the opposite, maybe they should have saved the money for the "evil" content and put it to good use on the "good" playthrough if they didn't care about how the "evil" path feels, but that's just me.