Look, it's decent enough. It's interesting--it's cutting--but it's not funny. And isn't that the litmus test for a comedy?
Every story is tragic, every character is tragic, every personality, quirk and inflection is tragic. Even the one-liners are laced with insecurity. The flimsy comedic packaging only serves to detract from what is otherwise a truly impactive tragedy. For that, I'd still give it an 8.
But these are incredibly accomplished actors, capable of intensely gut-wrenching drama and seemingly effortless wit alike, yet the scenes in which they are high are no better performed than a particularly bad preteen's attempt in drama class. They are as convincing as the press release for a metal condom on the 1st of April. When portrayed well, drugs can be as everyday as a torn carrier bag or as frighteningly intense as the very best thrillers. If you're sucked out of the moment to ponder whether the actors have ever spent time with someone on drugs, or have been so wrecked themselves they only remember the glaringly obvious, it's just not done well. It's 'high' at the basest level. That's a point off.
Another is removed for how blatantly political it is. The writer is painting a very clear picture of someone shouting "You ruined us! You ruined us!" with none of the accommodation of fallibility. She's right. They did ruin us, and it's a crying shame, but writing stories around an issue that all have the exact same moral doesn't give the issue any more depth. It actually does the opposite.
Finally, I can't even remember smiling, much less actually laughing. Even Broadchurch gave us a couple of grins. If it's just going to make you depressed, can you really call it a comedy?