First off, the performances were great -- not to mention the chemistry between each of the actors. Idris Elba's character 'Charlie' felt most genuine and believable (also likeable) primarily because the character is somewhat based on certain aspects of Elba, and it always feels like Elba has the freedom to be himself during each scene (which is a refreshing thing to see, honestly).
The other actors were good too, particularly Frankie Hervey who plays the little girl 'Gab' -- a character who 'Charlie' is assigned manny to. Despite being a spoilt brat, the character manages to not get on the viewers' nerves but rather make get them to empathise with her.
The screenplay is nothing extraordinary, but doesn't need to be. It's surprisingly to the point, while covering each characters' point of view and leaving enough intrigue for possible future seasons. Despite disagreements among every character, you can still understand that they're somewhat right in their own way -- which is a rather difficult spot to hit while writing drama.
I'm glad that the show avoids certain clichés that I had predicted, clichés that you'd often find in series/films of similar genre.
Other than that, I was hoping the show would also delve a bit more into the protagonist's backstory and the reason for his passion of being a DJ, along with incorporating music more creatively into the visual storytelling instead of merely being a plot tool to further the story. I'm hoping they delve more into the backstory and the DJ aspects of the story in future seasons, along with being a lot more creative in its cinematography and editing.