I'm part of a group that still holds 3-4 LAN parties a year with ~16-24 seats. We play mostly older stuff and it's still as fun as it was back then.

Gaming has changed dramatically, but it's not like that old stuff disappeared. Sure, some games don't hold up well in the slightest, but the good ones have. Some favorites are AoE2, Unreal Tournament 2004, Re-Volt, C&C, Natural Selection, Call of Duty, and oh god so much more.