Some multiplayer shooters have a certain stickiness to them and long after the official release the online community remains strong. Counter-Strike is a good example.
Originally released back in 2000 as a Half-Life mod, there are strong communities still around playing the original Counter-Strike. In fact, any time there's an update or patch the online community goes a bit bonkers because "upsets the balance" or "forces new strategies.". That level of community involvement is rare for multiplayer shooters nowadays. One of those titles is Killing Floor.
