Inquisition is a really beautiful game, the areas are huge and the characters are dynamic. All this combines to make the play feel quite realistic.
However, I agree that work could be done to strengthen the relationship between the player and the companion characters. Party banter is one of my favourite elements and I think it has a whole lot of potential that hasn't been explored yet. For one, I remember a point where the Inquisitor could partake in banter. I'd like more of that. Desperately.
The companions chatter away, including everyone but the Inquisitor, who adopts the persona of an unapproachable, isolated blob out the front. If there was even the option of butting in, maybe with a smart remark or a response to a question that is asked of the Inquisitor, for a change, I'd jump at the chance.
Back at base, the Inquisitor is always the one chasing them; the relationships feel forced. The friendships would feel more natural if they occasionally sought the Inquisitor out, then I'd be more convinced that they like the Inquisitor's company. On that note: more casual conversations. If the companions asked more personal questions, it'd feel like a more equal relationship, and it would help shape the main character back story. The companions come equipped with lovely back stories, but the Inquisitor comes without such a layer to their personality. I like that it is open, but it is also empty, and some hints here and there would go a long way - the player wouldn't have to be one of few specific channels to make an impact. Some vague references could give the player the feeling of a traumatised hero, provide reasoning behind a reluctant hero, the consequences of being raised innocent to harsh realities, etc.
The other point I would make, is that many side quests were a bit too similar, making the game seem long and monotonous. At some point the quests felt like they were taking the Inquisitor in a different direction, like the game had diverged from the point. I adored the plot, when I got around to it.