Quake 2 is much more than a game; it's a gaming phenomenon.  This game set the standards and provided the very engine of hordes of first-person shooters (as well as less kill-or-be-killed oriented games) that followed in its wake.  It took online gaming to new heights with its plethora of multiplayer options.  Gamers the world over designed their own maps and created their own online worlds in which to raise havoc against the Strogg hordes as well as their best buddies.  Some seven years after its release (in 1997), Quake 2 is still more than capable of brazenly stealing one's entire day, weekend, week, and beyond.  Quake was great fun, mind you, but there you were on defense, trying to defend your planet against these mechanistic aliens who decided that humans would make great raw material for new cyborgs (although some lucky individuals would of course find their ultimate fate in the form of exotic ingredients for certain Strogg gourmet delicacies).  In Quake 2, you take the fight to the Stroggs, by gum; you smear their guts across their own walls; you add a little chaos to the uglified place they call a home planet, and you make those soldiers pay for having dared attack Earth; before you're done you bring Makron himself, the biggest and baddest Strogg of them all, to his knees before terminating him with extreme prejudice.