I thought it was done very well...the only gripe i had was that Paul Anderson tried to make parts of it too much like MOrtal Kombat..namely all the hard core music during the zombie raids and whenever there was a bit of action..i swear i almost was prepared to hear someone shout "MOOOOORRRTTTAAALL KOOOOMMMBAAAAAAT!!!!" then Que the techno/hard bar chorded music and commence to rip shit up...that kinda gave it a more action fight kinda feeling when they should have left it to either no music, or jsut loooow key creepy soft ended music to make the fear and tension raise. Instead of being scared i wanted to jump up and shout "Yeah muthafuckah, blow dem shits away baybeeee!"

Which was annoying as fuck...but other than that it was pretty groovy.