Call of Duty 4: Modern Warfare review at IGN.

"Back on Game Boy Advance there was an amazing obsession with pocket first-person shooters. 3D environments were no easy task on the hardware, with most efforts resorting to classic raycasting engines circa Doom and Wolfenstein, but for some reason that development bug ran wild for a few glorious years of low frame, low res FPS goodness. For whatever reason though, pocket FPS development has slowed down considerably since the release of the Nintendo DS, with only the mediocre Goldeneye: Rogue Agent, impressive first-party Metroid Prime Hunters, and recently released survival horror Dementium: The Ward."

Full Source: IGN