All things considered this isn't a bad film, the acting is good, sets and locations are stunning, cinematography is brilliant and the script has some legitimately hilarious lines in it that will have you (if you're like me) barking out a laugh. The pace is steady, and it's not too complicated or cluttered with superfluous bits and pieces thrown in to bulk it up. I also like the way (however predictable some may be) that they had people disappearing. It was clever, good camera and effects work, subtle and understated but still impressive.
Now to the negative... Despite the build of tension and the myriad of questions the films raises, don't hold out much hope for any answers. You won't get any. Maybe this was a deliberate effort because they're intending a sequel (I would be more than happy to watch that, and I don't often vote for sequels) or maybe this is a Nolan-esque leaving it to your imagination ending. Whatever the answer, it's a rather frustrating to come away empty handed. If this is left open ended in this way for a sequel don't fret, it's not one of those obvious "And we are clearly setting this up for the sequel TAKE THAT SUCKERS!" type deals. Much more subtle than that.
All in all I have to say it was a pretty good film that held my attention in a way a lot of films of late fail to do, and I'd recommend watching it if you're bored or the idea the films posits interests you. But don't get as mad as some reviewers on here if it's not a 10/10 masterpiece of cinema gold. It is what it is, don't expect the most breathtaking piece of cinema known to man that answers all of the questions you have about life, death and why we're here.
