When Doom 3 was released five years ago it was met with two major criticisms. Players lamented the lack of innovation to the gameplay that was as old as the series itself, and that it was generally too dark. Doom Resurrection -- the new on-rails shooter based on Doom 3 -- actually manages to emulate the original game, provide a challenging experience, and overcome the source material's biggest critiques. All from your iPhone. How does Resurrection do it?