The director and main writer of Quantic Dream games, David Cage, is so much of a hack that the best part of Detroit: become human is Connor's story. The reason? The two main protagonists of that plotline jelled so well that decided to go off-script constantly, much to the dismay of Cage. He finally relented (because other writers and devs pushed to keep the improv dialogue in) and let others take control of that part of the story, focusing instead on the 2 other plotlines.
The result: those 2 plotlines are absolute trash nonsense and boring while the Connor one is at least entertaining with some funny moments.