Zone of the Enders
I picked up Z.O.E. pretty much only for the MGS2: Sons of Liberty demo that was included, but I was pleasantly surprised by the game that was packed in with my demo purchase. The mech combat game, was unique and simple to play using the games excellent lock-on system. Mech design by Yoji Shinkawa of Metal Gear fame helped round out the reasons this game made it on this list.
