This is what zapped my interest and I wonder if I'm not alone...
To me, a fundamental error the filmmakers made was having an unlikable lead. I just did not like or care for the character and when that happens in a movie or program, my interest bottoms out.
Surely, there could have been a way to develop this character as a troubled, LIKABLE, character instead of a self-centered and vapid brat.
I also would have liked to have had just a bit more lighting of the darkest scenes so the horror of the cenobites (right?) could be more clearly seen.