Derivative by definition, the movie pits Eden against a series of enemies and challenges that showcase her courage and intelligence (a la Ripley in the
Alien films) as well as her lethal expertise (shades of
Resident Evil). The predictable, video game-like plot doesn't allow much in the way of character development, though Eden does admire team member Sergeant Norton (Adrian Lester), who displays a singular moral sensibility, and so, must suffer dire consequences.
Like Neil Marshall's other films (Dog Soldiers and The Descent), Doomsday is full of gore and fierce battles for survival. It also alludes to social/political issues like AIDS and the Katrina catastrophe. Still, such broader dimensions tend to be overshadowed by the harrowing, bloody action. While Eden draws obvious inspiration from her tough-chick role models (Linda Hamilton, Kate Beckinsale, even Buffy), she's also a vaguely new kind of mad girl. Anticipating the direst end, Eden chooses the cannibal punks, declaring herself for them, in terms they appreciate. It's a grim resolution, even in this post-apocalypse.