I'm in act three right now, and the most noticeable issue I've run into has been characters mistakenly referring to choices I supposedly made. Really takes you out of it when that is such a focus of the game.
I also have Minthara in my party, and I can confirm that she's broken as hell. You give up quite a lot to recruit her, and it's not worth it at all. Don't do it.
And then unsubscribe from here: https://www.gog.com/account/settings/subscriptions