The believability of the central romance is help hugely by the two leads, played by the ever-reliable Matt Damon and rising Hollywood star Emily Blunt. The trouble with a lot of other on-screen romances is that the two people in question rarely have any genuine chemistry and therefore the dialogue they deliver - professing their love for each other and whatnot - isn't authentic. Thankfully that isn't the case here. Damon and Blunt have terrific chemistry that really grounds their relationship when all of this crazy, fantastical stuff is going on around them.
Along with the convincing romance and often fascinating mystery, director Goerge Nolfi (making his directorial debut after writing such films as The Bourne Ultimatum and Ocean's Twelve) chooses to employ some visual trickery to enrich the film's world. The most notable of which is the jumping to different locations within the city just by opening a door a certain way (one of the "powers" the members of The Adjustment Bureau are given in order to carry out their work). It gives you something interesting to look at while you keep up with, and making up your own mind about, the mysteries at hand.
What could have been a project with an interesting premise that falls flat on his face upon delivery turns out to be an engrossing and genuinely intriguing thriller with a romance at the centre that you can not only believe in but really root for. Undoubtedly the questions the film raises about fate vs. free will, order versus chaos, are way bigger than the movie can explore to the fullest extent. However, the film can be admired and applauded for giving it not just a fair shot but for delivering something so entertaining.