Hard to define, go watch it.

Rating: 8/10 (24 November 2012)

Before viewing this movie, I thought it was going to be about time travel. Don't get me wrong, the movie does contain time travel. But it isn't about time travel. I'm happy that it isn't about time travel, because if my expectations had been met then it would have been an 'okay' film. It's better than that.
The first forty or so minutes you might be sitting and wondering what's so great about this movie. The plot is only slightly original, the plot holes are big as they come and the characters aren't that interesting. But then slowly the pieces start to fall together and the real plot appears. Far more intricately woven and suspenseful then you would've imagined in the beginning. The story builds character, then completely destroys it as mixed emotions rule the scene. Without spoiling anything, a character you might have been rooting for becomes its antithesis. Something I haven't seen often in film.
As for the specifics, the rationale, the paradoxes that accompany the concept of time travel; Like a character later states, "It isn't important."