Predestination is based on a short story, and it shows. They added some things that weren't in the story, but it's not enough. The framework of the original idea is really all that's there, and it wasn't worth my time. I was expecting a flashier action/fantasy-type movie, and it turned out to be straight drama.
The trailer for Predestination made it seem like it would be all futuristic, but a weird 40s-style future, and flashy and exciting with the way they do the time jumps, like an action/fantasy movie. But it was actually pure drama; borderline boring drama. It was such a narrative. I wasn't surprised at all to find out it was based on a short story. It had a real "short story" feel to it. I don't think they had enough here to make a movie out of, even though they added things that weren't in the story. I feel slightly disenfranchised being sold a movie that turned out to be a short story, now that I think about it.