There are a lot of haters for this movie, mainly because of dissatisfaction with how the film ends...

And to be honest, the ending was a little open, but I don't think it mattered. You see, up until that point, I enjoyed the movie. The story didn't drag, and while it was never quite clear what 'the event' was or why it happened, I'm not sure that was essential to the film. It was more about the journey and the characters within, and their attempts to find clarity with chaos. Despite the occasional implausibility, the setup was more realistic than Hollywood's usual bombastic disaster flick, and that made for something quite refreshing. And as for the ending... well, I would have liked more, I would have liked more explanation, but its not a dealbreaker that it was, perhaps, a little underwhelming. As alluded, the journey is sometimes more important than the destination.