If it were me, I'd toss in:
Angry Birds: The free game that took the world by storm and showed that mobile games could compete with other games just by being creative
Counterstrike or Call of Duty: Insanely addictive online FPS experiences that border on obssession
Geometry Wars: Showed that there was a mass market for downloadable titles on consoles
Super Mario Kart: created an entire genre almost single handedly (GTFO, Rad Racer/Rock N Roll Racing fans. This was different!)
Wii Sports: Ushered in the motion control craze that was hinted at with the Power Pad, Power Glove, and Activator
If not Call of Duty, then Quake III for giving us console owners an online FPS (as well as console vs. PC play) on the Sega Dreamcast
Guitar Hero/Dance Dance Revolution: the foundation of the rhythm games. Not the first but the ones that sucked in non gaming audiences
