Based on the Philip K Dick short story, the film does pose an original an idea. What if we are being guided or influenced all our lives... what if THEY are already among us?
When Matt Damon accidently sees beneath the skin of the world he must fight to save a love that does not yet exist, and maintain his own sanity. There are some great moments in this movie; I love it when the "adjustment team" complain that they are chronically understaffed.
But there are some clunky parts too: everyone seems to assume that the adjustment team are benevolent. Couldn't they equally be devils or aliens working against humanity.
There are some novel ideas in this film (and it is interesting to see it's influence today, particularly in stories like the amazing The Demons of Emily Eldritch (The Spirals of Danu)
) but ultimately they are not explored to their fullest.