as a selfpublisher i tell you: dialogue isn´t written like people really talk IRL. Readers would go nuts over it. You need to put Information in ever sentence to either, further the plot, show what characters are thinking etcetc. But people don´t do that, they assume, suggest, stutter, repeat ... it´s a horror to read real-people-talk.
But i second your message about slacking scriptwriting. DS needs more "bonding" between a lot of scenes. Some are good, like the talks with Kira and mom, but others are "stumbly"