Just got back from seeing it, and super-enjoyed it. I mean, it wasn't anything deep, but it was a fun space opera to watch.
It is a general law of movie-watching that if time travel is involved, it WILL NOT MAKE SENSE. EVER. EVER. EVER. So do not even try to resolve that issue, because there will always be plot holes. This has been true in every single movie ever with the concept of actual time travel, since the dawn of the cinema.
So, you just need to sit back and enjoy it for what it is.
Plus, Chris Pine and Anton Yelchin are so super adorable.
