Here are some reviews for a movie: 1. A jigsaw puzzle made of pieces that may or may not fit together, it assumes the intelligence and interest of its audience, a brave move that pays off big.
2. Carruth challenges us to imagine the impossible, then asks us to consider the moral, ethical and spiritual implications of what we have witnessed, and put those considerations on equal footing with man's desire to go where no man has gone before.
3. Even as Primer's plot ends up seeming contrived, that is, arguably, the thematic point: stories are always unstable and untrustworthy.
4. A smart, clever time-travel game played on audiences and with them
5. I don't need to be spoon fed, but unlock the kitchen for me, would you? And get a new sound guy.
6. It takes a lot for a movie to surprise today's jaded, seen-it, bought-the- PlayStation-version sci-fi fan. Primer can. Let it.
7. It's one thing to admire what writer/director/composer/actor Shane Carruth wrought on his $1.98 digicam budget; it's quite another to have to sit through the mind-numbing results.
8. The ingenious debut of writer-director Shane Carruth, who assembled the film on his home computer and also plays one of the two leads, is purposely designed to be a little bewildering.
9. It's a tiny-budget indie film with an interesting sci-fi story premise. Too bad the mystery overwhelms the humanity, so it doesn't quite work.
10. Eerily, unswervingly transfixing.

What was the overall consensus about the movie?
Dense, obtuse, but stimulating, Primer is a film for viewers ready for a cerebral challenge.