I think that Stephen Dunn just doesn’t quite have a command on the form, which is understandable, as he’s never overseen an entire TV series.
The casting for Brodie (and the characterization) really let them down too. Devin Way, while he’s 32, is too young-seeming, for one, so much so that he often seems like a peer or even younger than Mingus, the high school kid. (Maybe that was somewhat intentional, to downplay the problematic power differential or to drive home how immature Brodie is.)
But Brodie is super grating like a yappy dog. Both Aidan Gillen and Gale Harold had this world-weary confidence and intense sexuality where you understood why people were attracted to them (and Aidan G. wasn’t even that great-looking, which the UK series acknowledged).