I saw this film in a cinema - there were clearly people left bemused by a film with its suggestive title and lack, thereof, of any kind of big budget blasting of gory monsters. And therein is why I like and would reccomend 'Monsters' wholeheartedly - it is a completely different kind of film to anything I have seen before.
Its a complete amalgam of genres and wears its influences unashamedly on its sleeves. Part road movie, big part love story, shot part documentary style, with incidental dialogue that doesn't neccessarily always spell exposition moving forward, 'Monsters' is, ultimately a meditative science fiction film, perhaps most closely mirroring the pace of films like 'Blade Runner' and '2001'. Its a story of two souls who start apart, but gradually find each other on the course of a strange and bizarre journey though the 'infected zone' - a cleverely devised conceit that imagines a new border between Mexico and the USA - one controlled by Aliens. The Aliens, when they appear (because the 'monsters' of the film are left in a little dealt by the end), are wonderfully realised, despite Gareth Edwards' shoestring budget - the phrase 'less is more' fits well here, and the ending is a masterstroke that left me thinking and feeling that I needed to watch this film at least once more.
Also, the score by Jon Hopkins is absolutely brilliant - anchoring the wonderful images in a dreamy, bleary soundscape - well worth checking out on the Amazon Mp3 store.