Ok so no CS isn't in there..just yet. But as I was reading gamespots Top Ten most infulental games, they had a mention of half-life and then even went on to say this..
Coincidentally, even the user-created mods for Half-Life have proven to be quite influential on the mod-making community. Counter-Strike, one of the most popular mods for any first-person shooter, has been picked up by Sierra Studios for publication later this year. Its terrorist/counterterrorist formula has proven to be so popular that other users have since released mods with similar scenarios for other games such as Quake III: Arena and Unreal Tournament. Whether it's a commercial release of a stand-alone game or a simple third-party mod, Half-Life's influence on the first-person shooter genre is undeniable and will continue to influence the development of games for years to come.Somewhat interesting for this early morning read.