(spoiler)Very interesting angle for the vampires against humans cenario. The Spierig brothers created a (near)post-apocalyptic world, not too much unlike what we would see in some zombie flicks. This was 2009, the year True Blood's second season would premiere. Long before Neil Jordan's 2012 and Jarmusch' 2013 contributions to the vampire cinema collection. And yet I'd add it to those rare inovative bold titles.
I enjoyed thinking about the civil struggles of a vampire society, specifically the dissociation between vampires who had enough blood and vampires who did not have enough blood, behaving almost as separate species when deprived of what was essential for "civilized" conduct. I also enjoyed the strategem in resolving vampire civil struggles ie capture more humans, develop a blood substitute, cure vampiricism.