I liked this because it's so over the top. Everything Bad Happens... because of BDSM and DRUGS!!! #SexDrugsandRock'n'Roll
People (me included -- and no, I don't use any, and I don't think you should treat actual addicts like shit either) are hung up on the drug depiction because the story IS about addiction, even if it's meant to symbolize something else (addiction to a person? It could have done that more effectively without the drugs.) And it's... addiction understood as this selfish individual act of irresponsibility that makes you have Dangerous Sex and accidentally kill your girlfriend. Come on, this is cartoonish. "woooow that is So fucked up!!!" <-- this is the reaction it's trying to elicit and I'm sorry I cannot turn my brain off to sit back and enjoy it for what it is. The drug use makes the whole thing look so exaggerated and silly that the salvageable parts (the emotional blackmail, the abuse) get muddied into that mess.
I did! Enjoy the drug-fueled sex scenes, because they looked so wrong and I love that kind of thing.