Whenever I am at lan parties my buddies want to play CS 1.6 and I don't understand the appeal. They only play de_dust2 too. I find it so boring. Everyone buys exactly the same weapons (m4a1 for antiterrorists, ak47 for terrorists). Everyone runs pretty much to the same spot, there's an exchange of blows, one team wins. Repeat. They don't even try any other maps or other weapons or anything.
It only had de_dust2, but we played so many hours on that game.