The TRON/Lightcycle genre is at its very best as a PvP(xN) game. Haven't logged in for years, but there used to be dozens of very active servers running Armagetron Advanced, and it looks like it's still going:

http://armagetronad.org/index.php

A very fun, fast paced, social, arcade-like gaming environment for someone not invested enough in gaming to delve into the likes of WoW or similar.