I watched this with someone who has read a lot of science fiction, and apparently knows a lot about the rules of science fiction time travel. Once the movie was over I turned to them and asked what the hell we just watched. They answered with you need to read more science fiction. I guess that maybe I do, since my head literally hurt after watching this movie. I wasn't sure what the point was, so I took the night and thought about it, trying to figure out what the point of the movie was. I didn't, but I realized that it was a thinker and I didn't hate it.
How do you travel through time in a casual loop when you yourself have no origin? This was the question asked in the movie, and it was never really answered. Another question, can you change the future if you travel to the past to change the future? The answer to this is apparently no. If you try to change some things you can't because some things are destined to be, hence the title PREDESTINATION. This presents a problem to me. If a movie is all about the question "Which came first, the chicken or the egg?" What is the movie really all about.
Is it asking if we are all in a time loop? Is is trying to tell us that we all just do what we were predestined to do, like zombies? Changing one thing never changes another and you can't change what you do in the future or the past.
I recommend this if you are a science fiction fan, also think you might enjoy this if you aren't a science fiction fan. I can't say I understood all of this, but it really made me think. And movie that make me think are always my kind of movies.