I'm glad to know the story of these artists and see their work, find out how São Paulo treats graffiti, but I think the presentation could have been tighter. Probably could be cut down by half and organized better; it felt a bit repetitive, and although I liked the window into their work scene, it dragged during the times they were just swearing at each other or complaining about dead batteries.
Excruciatingly long and loosely structured, Grey City quickly loses steam as it reiterates ad nauseam the main narratives, i.e. the cat-and-mouse game between graffiti artists and authorities and the lack of recognition for street art in Sao Paulo. Those who were looking for the Brazilian equivalent of Style Wars will be likely disappointed.