I feel like Oathbreaker is something they should have cut and added back in for a later patch, as it feels half-finished sadly.
I found it far too easy to accidentally break my oath; while siding with Gortash is a more obvious breach (being that he's an evil Bane worshipping tyrant), there are a bunch of moral decisions that aren't nearly as clear-cut but if you make the "wrong" choice your oath is immediately broken without warning.
They really need to either highlight which options will do it, highlight options with [Paladin] for the "correct" path, or give a strikes system for more complex choices, i.e- first time you make a dubious (but not outright "evil") choice you get a warning about your oath.
But then I also broke my oath by having Astarian shoot first when encountering a group of Bhaal cultists that I knew were trying to ambush me (I think maybe they were flagged incorrectly as still friendly, because I got the "You picked a fight" narration), so there are definitely cases where it's just buggy too.
