I watched most of the first season with my lady. Tapped out after a few episodes, but kept the facade up until the second to last episode of the season. Then pulled the patented move of delaying watching the episode until later, but later never comes.
It's an extremely well shot and designed show, and the music was pretty good. But this was a combo of two of my least favorite modern TV tropes: high end teenage drama made for adults, and completely irredeemable main characters. The show establishes pretty early on that Rue is every bit of the addict that she says she is, and most of the show just toys around with the audience's idea that she'll pull out of it by continually reminding you that no, she will not.
Eventually it just turned into trauma voyeurism, because the main plot essentially boils down to sitting around to see how bad rock bottom is when she eventually hits it.