Forget every supposed shooter innovation since. Forget every custom game mode, or option, or bonus challenge, or crazy, emergent meta-game you have ever seen or heard of in an FPS. Forget everything you think is “a Halo thing”. Forget everything you thought was exclusively Battlefield’s forte. Forget how clever and fresh Gears of War 2’s Horde mode supposedly is. Forget this whole generation’s predilection with campaign co-op. Whatever you can think of, TimeSplitters 2 did it all. And it did it bigger, and it did it madder, and it did it in much greater volume. On one disc, with no additional DLC charges.
This. A million times this.