These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Martha Marcy May Marlene
Award Snub: No Oscar nomination for Olsen, especially when it was highly predicted?
Family-Unfriendly Aesop: Interestingly, while the movie does generate sympathy for Marcy, it also makes Ted seem reasonable in his view of her as a leech. There seems to be an implication that the only reason why Patrick was able to get so many people to give up possessions and live with him in the middle of nowhere was because most of them knew that if the whole thing went South, their families would bail them out (one of the members even notes that whenever the cult is in need of money, she can ask her father for help, who's happy to give her money so long as she doesn't spend it on drugs). So basically, "hippies are social parasites."
Nightmare Fuel: This sums up the entire film. It is one of the few non-silent films that does not use or need extensive dialogue to explain what is going on. Much of it lies at the level of subtext (see the fridge horror section for more information).
No Ending: We don't ever find out if the cult is real, if the man following them is a cultist, if he tries to attack them, if he follows them so the cult can come after Martha later, if she ever gets over her obvious mental health issues, if she ever tells her sister what is going on, or if she ever repairs her relationship with her sister (assuming she isn't killed by the cult). If the cult is real we also don't see if they eventually get shut down over the murder, rape, and implied infanticide. If it isn't real we have one clue (a fragment of an excuse about a boyfriend) as to what might have really happened to Martha and nothing else. It would be as if Black Swan had ended twenty minutes earlier, mid-scene.
Arguably, this is the overall point of the film. The true focus of the story is Martha showing, admitting and eventually seeking help for her mental problems, rather than Martha running away from the cult.