I am shocked this has such a high rating.

Couldn't agree more. Another example of a film maker who is trying to promote discussion by presenting us with something that was never meant to be fathomable. He knows that, but we're not supposeed to. Anyone who claims to "get it" is lying. There is nothing to get. Dreadful.

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Not sure what kind of response you're looking for.
Obviously, different people want/value/expect/like different things in movies/dialogues/story-lines, and that rating is what it is, because the movie appealed to a lot of people.

What you consider a flaw, may have a different effect on another viewer.
For example, the "improvised" dialogue (especially when they talk over each other) was something I really liked - it lent to the credibility and realism of the scenes and thus increased my enjoyment of the movie. And you can say similar things for all the other aspects of the movie which you didn't like. If you don't like something, it doesn't mean everyone will share your opinion.

This film's intention was to show ordinary people in extraordinary circumstances. Their fear, confusion and the resulting state of mind are depicted pretty well. Their dialog is just a reflection of that. Could this have been made much better. I think so.

The acting wasn't very good but I really really enjoyed this film and I would happily watch it again. Especially to further analyse who was who in which reality.

On the other hand, I am not a native speaker of English, therefore I may be forgiving bad acting or dialogues easier than natives.

So ... did you write your review in the review section, but perhaps felt it was not good enough because it would just get buried and there would be no one to give a "yes, it was very helpful" click? At least not in this particular reality.

It's not a movie for everybody and I have friends that I would not recommend this movie for as they would find it boring.

I thought the acting was great and very believable. It reminded me of friend gatherings I've been in in the past ... without the sci fi stuff happening.

I think with a bigger budget, there are things that could have been done better. My interpretation of alternate realities not everybody would be the same in every house party reality, nor would the hostess even be in the same type house with the same friends. Not every self would be wearing the same thing or be at the same weight, haircut, or spouse.

Surely there was a reality where Em divorced her husband or even murdered him.

Why in this reality is it so important that you can judge a movie and feel that your opinion always reflects the general mass opinion of a movie. In this reality, it didn't so you ... uh what come to the board to get backup because something must be wrong with the rating on imdb. Perhaps something fishy, because afterall you are never wrong when it comes to movie ratings on imdb.

Or to promote your horror blog, which btw, is pretty stupid given the rating of the movie. You just convinced me that I would not get anything out of your horror blog and it would be a waste of time for me to check out.

The only people who are going to check out your blog are people who mainly agree with you and your taste. So you really picked a stupid place and way to plug your horror blog.

easy: the script is supposed to have a deeper meaning, while still having a mainstream appeal. that's enough for many people. on the other hand it is dumbed down enough for everyone to understand. it caters to a certain part of the mainstream crowd. those that for example would refuse a gilliam film for being "too complicated".

Do you realize that your OP is right out saying "I'm a *beep* stupid *beep* who didn't get the movie"?