Mirror's Edge is a different kind of game. It uses the familiar first-person graphics perspective, but it's not a shooter. It's an adventure game heavy on problem solving. One that has you running on roof tops, doing flips, and scaling walls, all while the camera jarringly follows, much like your real eyes would in a similar situation.
In addition to its unique visual orientation, Mirror's Edge also boasts an original story. You play as Faith, a female courier with ninja-like Parkour skills, who is tasked with delivering sensative information by foot because her totalitarian government has taken complete control of all forms of electronic communication. It's an interesting and believable premise and effectively sets the stage for all the traveling you'll be doing.
One major concern upon first seeing the game is that of motion sickness.