This could of been a nice fresh take on the time travel storyline but it is entirely predictable. The paradox is impossible and completely flawed you couldn't come into being spontaneously grow up go back in time change go back in time to meet yourself then become both of your parents. You would of had to of had parents in order to exist in the first place which makes it not a paradox at all but bad story telling lazy lazy lazy. Not only that but you're the hero and your future self was the villain that was the only remotely interesting part of the whole thing that was even remotely plausible in a completely fantasy time travel way. Nothing in this movie was remotely interesting.

If you're and Ethan Hawke fan then go and watch day breakers or assault on precinct 13 or gattaca he's brilliant in all three, the latter two especially this however you could miss and you'd be all the happier for it.