As long as it avoids anything closely resembling the real world, Ouija works. Not as horror, but as a cautionary example as to why "gotchas" don't necessarily equal scares.
Even with all its XXX gimmickry, Nymph()maniac remains grounded in character. From someone like Von Trier, we'd expect nothing less, and we even get a lot more.
It's the brutality of Saving Private Ryan without the jingoistic flag-waving, the one-two punch of Clint Eastwood's Greatest Generation epics sans the strident moralizing.
Like a hack tunesmith that keeps rewriting the same melodies over and over again, hoping his legion of fans don't notice the ruse, we've heard this Sparks song before.