I still go back and replay some of my old favorites again and again:
Soulbringer--One of the creepiest atmospheres ever--you can cut the gloom and doom feeling with a knife.
Lords of the Realm II--My first ever computer game.
Lords of Magic--Something of a fantasy version of LoR II.
Arcanum: Of Steamworks and Magic Obscura--One of my favorites--the mix of magic and technology was intriguing.
Medieval: Total War--Battles are meh, but strategy is fun.
Still playing EverQuest II and The Secret World MMOs, and still pop in to the Vanguard: Saga of Heroes emu project from time to time to help my Vanguard withdrawal after playing hardcore for 7 years and then having the game closed.