If you think of this movie as Sci-Fi, it is a mess. Let go the Sci part, and look at it for what it is. Fiction or just plain Fantasy.

The issue is that the script itself doesn't decide what this is. Time Travel or Parallel universes. If they don't understand the difference, explains why everything happened how it did.

Now.. it is not total garbage. As the pro list, i could say it was fun, characters are likable, and the FX is decent. The con list would be that the story/dialogue is borderline stupid (honestly, you will guess every single plot twist before it even start), and the acting ability is amateurish. So, if you watch this not expecting a mind bending movie, you might enjoy it. (Hey, there are some hollywood movies about the same topic that are completely moronic... )

Watched the movie on an international flight and I was actually pretty surprised at how good it is. Personally I really like how Chinese sci- fi seems to "get" what it is to be a researcher better than western counterparts that hype researchers to be either super-humans capable of achieving any unlikely task or crazy evil logicians. I was really impressed with how well thought out the time travel was and I honestly could not point out a flaw (which is pretty significant since most movies end up screwing up when messing with time-lines). There are even clever little markers throughout that are important further on but aren't spelt out to you that makes me thing the director respects the audience. For example (spoiler) you briefly see on one of the consoles that the H2 test subject becomes more violent. Now as Tia Xing goes through a second time you see her extremely violent but the key thing is they don't spell it out to you - I expected something like in Avengers where in this situation she would say "I am the second level time traveler, so I'm willing to do more than you, and kill anyone in my way" - but no that is something they expect you to pick up - that the degradation is what resulted in the breakout from the other bases etc.