Timesplitters
Timesplitters is hardly ever talked about these days, and that's sad. That series by far had the best multiplayer of any game series of its time with replay value that's unmatched. And what other multiplayer game would I get to be a dinosaur setting a circus bear on fire with a flamethrower and shooting a gingerbread man in the face with a revolver?
If they ever brought Timesplitters back with online multiplayer, it would blow the shit out of TF2 and Overwatch. I guarantee.