5: Call of Duty 4. Spawned a huge craze of FPS on consoles and made CoD become a titan franchise that carried the HD twins to better times behind their costly launches. Only on here because of how it changed console gaming habits, and its economical impact, not innovation.
4: Quake/Unreal Tournament: Defined the PC gaming experience in the nineties and established the competitive FPS scene. Still going strong today.
3: Half Life/Half-Life 2. Did a lot of technical pioneering, especially in AI, as well as spwaned the gigantic Counterstrike mod/Did a lot of technical pioneering, especially in physics. A lot of games used its engine afterwards.
2: Doom. Monumentally improved on Wolenstein 3D and turned FPS into a big genre.
1: Wolfenstein 3D. Defined and established the genre, simple as that.
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