Mintharra hating on you for breaking up with Bhaal is absurd. Bhaal is the Absolute, all that shit that she's bitching about non-stop happened while the brain was under control of the Dead Three. Now she's fine with selling out TDU's ass (and hers, and everyone else's in the world) to the same guy? To what end? Bhaal's endgame is a worldwide free-for-all, where the last living human climbs a mountain of corpses, looks to the sky and yells "I've won!", and this is is the future that Bhaal-controlled TDU will bring about.
Once again, the game would be considerably better if TDU was the Banespawn, not Bhaalspawn. In that case, Mintharra's logic would kind of make sense - at least Bane's ideal world is consistent with hers.