I saw it in Chicago. CHG was on hand for Q&A, which made the film a lot more interesting, I think, than it would have been by its lone. It's not easy on the eyes. The repeated snail-killing, in particular, cleared out about 1/3 of the sold-out crowd. It was, as Glover admitted, the hardest thing in the movie to rationalize.
I wouldn't call it "shock for shock's sake." When I hear that, I think of pandering, or exploitation wrapped in moralizing, which Glover has never done. It's not Crash, or that piece of shit Kids. It is a hodgepodge of images and ideas that would be cut, no questions asked, from any Hollywood movie. It's intended, I think, as a Jungian shadow for modern entertainment, the stuff that gets overwhelming power from a mass failure to negotiate it.
If that sounds like bullshit, then skip it.
~EmD