Wait, so Minthara not only doesn't have a proper romance, but also almost no content? She was the only reason anyone would even consider attacking the druids!
Good guys: + Halsim with romance
Evil guys: + Mithara (which is said to be barely better than hireling) without romance - Wyll - Karlach - Shadowheart romance - Loads of characters you'd normally meet in the third act.
So what's the point of playing evil? You will gain practically nothing and lose a lot of things.
It's like voluntarily shooting yourself in the foot!