Half-Life was the king of mods...I guess maybe the way that every game now supports mods has made the talent a bit more scattershot. I don't think there were so many games back then that could be modded the way you could with HL. Counter-Strike, Team Fortress Classic, Day of Defeat, Natural Selection...all quality games that spawned their own products in recent years. I don't think I've ever had so much game for so little money.