This flick is clearly not for everyone. If you need a fix of mindless entertainment, keep looking. If you want to try meeting the challenge of following multiple time loops that fold over on themselves, you'll be right at home.
Best viewing might result if you separate the movie into categories of Acting and Premise. Yes, the acting is uninspired, and the half dozen or so characters are largely under developed. They display a liberal helping of the nerd quality that goes with a small team (somehow) building a time travel machine unnoticed. But, their judgment ratchets back to plain ordinary or worse as they deal with mounting problems.
IMO, the premise and writing are where this story shines. There have been a lot of sci-fi tales that toy with time travel and multiple (or alternate) time lines. The easiest to understand and follow is the classic reboot, where events don't quite match a previous story, but story progression is relatively linear. Even when there is some interaction or movement of characters between parallel time lines, it's still relatively easy to keep up.
"Paradox" is the other flavor of time travel. In this case, the timeline includes not one, but multiple loops between the present and one hour into the future. Characters try coming to grips with concepts such as destiny, and whether they can alter the fates that seem to await all of them. At the heart is the question whether one can go into the past to change an event responsible for a current undesirable situation, and, of course, what happens if you meet yourself (or can you?). There is even an honorable mention of "Schrödinger's cat." The fact that a writer kept this all sorted out is worth the watch.
So to repeat: if you don't want to think, move along. If you want a challenge, press "Play."
