I've probably mentioned this before, but I enjoy Shadowheart's romance a lot. However it does feel as though something is missing in act 2 rather than 3 - directly after the Tiefling party (or her first romance scene) the pacing of the relationship just kind of pauses, and there's a huge gap where very little goes on between then and when it picks up again after the Nightsong encounter - yet it's indicated you're clearly in a relationship. You could explain it away with her internal struggle weighing up her ambitions to be a Dark Justiciar vs. feelings for the player character... but I won't. Compared to other romances it practically sits in limbo until you're all but finished with the Shadow-Cursed Lands.
Her reactions to choosing her -should you have pursued another potential romantic interest up until that point in act 2- and (romanced) Dark Urge waking her in the night to save her and also conflict with the state that the relationship is in.
Of course, more camp scenes that you can enjoy as a group would be more than welcome, this is something I've felt the game was missing since the first time I played.