Dak is slow to read defenses. He can throw to open receivers with the best of them, but he doesn't anticipate or throw receivers open. When it's desperation time, he tries to anticipate and throw receivers open, but many times, he's picked or incomplete because he's just not sure.
It's why the majority of passes look contested, because they're late.
I'm a Dak fan, he's servicable but must have a mauling OL, a scary running game, and good/great TE (2016), otherwise, gotta have a shut-down defense.