Why there are so many negative reviews.

Rating: 9/10 (22 December 2019)

It's an arthouse film. Other films in the same genre include: The 400 Blows; In the Mood for Love; Pi and Tokyo Story. These movies are not designed for the majority of people (I'm shocked it's rated as high as it is) but a niche.
Positive - This is experimental high art. The dancing is mesmerizing. The cinematography is captivating. The music is fantastic. The characters are defined. It's a visual and audio spectacle, an exploration of mass hysteria.
The plot is a kind of character study, the unraveling and disintegration of who this people try to be. Perhaps it's even a microcosm of modern France with a metaphor for her future.
Negative - The acting is not the best but it's believable enough, the actors had passion for the project and you can feel it. The story itself is factually misleading, LSD would very unlikely have that effect on people, PCP would be more likely candidate.
If you're looking for something weird and you wanna try something new. This might just be the movie for you.