The Adjustment Bureau was promoted as a stylish sci-fi film and it is stylish, but they explain the sci in a hurry, which deflates much of the excitement. Matt Damon and Emily Blunt do well in their roles, but the movie is more about their romance than the thriller that was promoted in the commercials.
All-in-all, The Adjustment Bureau was a decent movie, even with the bait & switch, but I had a big problem with the ending. Actually, to have a problem with the ending, you have to have a problem with the premise, but I'm only going to talk about the ending. It was based on a short story by Phillip K Dick. I've not read any Dick stories but I've seen several movie adaptations and I recognize that he writes dark stories. The Adjustment Bureau has a syrupy sweet-ending, so I'm guessing the movie followed his story closely but it wasn't one of his best, or the film-makers made their own ending. My guess is that this wasn't the planned ending. They probably had something darker in mind that the studio or test audiences didn't like, so they re-edited and threw in a voice-over to wrap things up.
My recommendation, for the Matt Damon part of the movie, is to watch anything else he's done in the past two years that you've missed (True Grit, Green Zone, Hereafter, Invictus, The Informant!). The guy is fabulous, but this movie was a misfire by his standards. As for Emily Blunt, her ultimate romance was in My Summer of Love (2004).