Lili Taylor gives a savagely kinetic performance in this representation of a disturbed individual who may just also have been a genius despite, or because of, her treatment at the hands of various men throughout her life.
Judging biopics in terms of historical accuracy is for the most part a futile exercise. There is no 'truth', only interpretation, but if you want to get closer to the facts you really should be in the library, not the movie theatre. The story of Valerie Solanas is especially vexing in this case, because were this a work of complete fiction, the script would never have been made. The 'so what?' factor is superseded by the fact that this actually happened, and the legacy of Solanas still divides contemporary feminists.
As cinema, the film succeeds through the charisma exuded in Taylor's performance. Her descent into madness is sudden, vicious and uncompromising. The depiction of the shooting, the moment the film has been leading up to, shows a human being divorced absolutely from her conscience. The groovy scene around Warhol's the Factory is both decadent and, viewed from the 21st century, slightly twee. The pastiche of Sixties nostalgia is less foregrounded than Solanas's brutal victimhood. The film begins with a reading of her psychiatric evaluation, where a litany of unpunished crimes inflicted upon this woman by various men is laid out. The female director sets her stall out straight away - what you are hearing now leads through a direct line of cause and effect to the monstrous act you will see committed by Solanas later.
If the film has a major flaw, it is the title. Audiences could be mistaken for thinking it is about a documentarian of Warhol's life and work. Solanas and her SCUM manifesto, for better or worse, have made their mark, and perhaps 'Solanas' would have been a more fitting (if less marketable) title. Did it take the shooting for that to be the case? A polemical moment in recent history relayed straightforwardly, this is competent, entertaining, edifying cinema.