I personally would rather more nuances to "failure", I want to charm Shadowheart but she rebuffs me now, but later on I do something heroic or evil that opens her eyes and she initiates a conversation recognising that she was wrong before. Black & White Suceed / Failure sucks. Sometimes it has to happen, I mean if you fail a last ditch intimidation roll and a fight ensues and someone dies, then that's that.
There is actually a good example of this in her romance scene. You can ask her to reveal something about herself, fail the roll, then have it be a mildly awkward moment as she teases you slightly for prying.
And then there's the scene when you ask her about her Sharran worship and fail that roll.
