My story with her was great, in the ambush in act 2 I completely flunked all my initiative rolls which meant the best hope for fixing her fell into darkness. The last gasp save of something felt great. It's a shame there's not much else for her though, all the characters stories are thin, it's a shame hers has to be depressing and thin. I'm kind of glad I spoiled myself on the possibilities because a replay on Karlach would have felt disappointing.