The man behind Dog Soldiers and The Descent, decides to steal imagery from Mad Max, Escape from New York and other movies without any context.
It starts with the UK under the plague of a virus (28 Days Later anybody?), but instead of zombies it's a disease. The protagonist is a Snake Plisken look-a-like only a female instead of a male, carried with a task of finding a doctor to find a cure. Sounds simple right? Think again. The Scottish from dumb reason, go half-naked with bondage gear, make-up tattoos and tight leather. The WTF scale goes off the charts when they escape with fully-functional steam engine (which will never work today) into a forest only to be captured and taken to a castle. That's when the movie jumped the shark. It appears that Neil Marshall is over his head in paying tribute to what genre he's doing. He doesn't know whether he should do a love letter to mind-blowing action flicks, or a serious post-apocalyptic disaster movie.
Many of the characters are flat and one-note. It doesn't help that the actors are so dull, they knew this movie will never be a huge hit. The film doesn't give us a chance to like them or relate to them. Which what happens if you go over your head in paying tribute of homage to a genre you grew up watching.
The Indiana Jones series is better homage, since they put different spins on them instead of just copying scenes and plots. Planet Terror and Death Proof did the same thing, mostly due to the fact that Quentin Tarantino and Robert Rodriguez have a passion for movies so much, they knew how to their own signature on familiar genres. Nobody should have high hopes for this, even for curiosity sake.