A manic film of such over the top excess it leaves you shell-shocked. But this is no crude exploitation flick but an art film, an indictment of religious hypocrisy and its close companion power politics. The sensory overload of its atonal soundtrack and graphic scenes of orgies and torture, combined with the sordid horrors of 17th Century France will be a bit much for some people. Others of course will love it for that very reason.
For more info on The Devils see Wiki entry here.