The original premise of the game revolved around a earthquake-ravaged Chicago, but was changed at the last minute into a post-apocalyptic survival game when Ubisoft was developing The Last of Us. Key differences between the two games vastly are apparent when playing them. The Last of Us is much more cinematic whereas I Am Alive, is more action, survival focused. Bleakly monochrome in terms of visuals as opposed to The Last of Us's colorful environments. moral choices, conflicts, etc.
Having just played I Am Alive several years ago on Xbox 360, the game still holds up to this day. It's solid gameplay mechanics, good voice acting, character development, and engrossing, yet bleak storyline, really makes it shine above its contemporaries, despite TLOU receiving much more high praise. So, to sum it up, I Am Alive is a title worth having in your library right here on good 'ol GOG. It may not have the highs of Naughty Dog's sublime post-apocalyptic thriller, but it will give you hours of enjoyment for those who are fans of the genre.
Here's hoping that it comes to GOG someday...