I'm also disappointed how little banter there is. But what's more disappointing is the lack of interactions between companions in our camp. There was literally just one scene with Shadowheart and Laz and that was it. I hoped for more and I had nothing similar for the whole game.
Dragon Age games and even Mass Effect 3 handled that stuff way, way better. Not to mention romances, boy, I was disappointed how little "romance" content Shadowheart had compared to the others.
Unforutunately, after act 1 it feels like the quality of the game dropped drastically in every aspect.