Reviving this old thread as I've never heard many people talk about this movie. I enjoyed it a lot more than I expected, so was happy to see a discussion.
It does seem like a remarkably similar premise to that Twilight Zone episode, as
veggieguy12 suggested, but you have to wonder who was inspired by who? The original short story that episode was based off was written by Theodore Sturgeon, a sci-fi writer mostly known for Star Trek in the '60s. However, Philip K. Dick wrote his original short story in '54. Parallel thinking? Or was Dick ripped off?
In any case, the film goes much much further in developing the world and asking philosophical questions. Ultimately, it's about destiny versus free will, and I actually love that they find a way to incorporate ideas and mechanics that would work for both atheists and a theistic point of view on these things. And unlike Interstellar, it made me believe that 'love finds a way' wasn't just some cheesy deus ex machina.
Yes, the ending may have been a bit too neat, but I found it to be earned. The couple's growing understanding of their situation and continual re-discovery of and re-commitment to each other works as a great metaphor for marriage or any long-term relationship. I bought the message that "we have no fate but what we make", and I liked how it was balanced with a kind of fatalism like "God protects those who lock their doors".
It's a rich movie to dive into, but presented as a Hollywood thriller. Dick has been blessed to receive several films that got similar treatment, like The Minority Report, Total Recall, and Blade Runner. Adjustment Bureau isn't quite on that level, but I'd urge anyone who wasn't so keen on it to give it a re-watch.