i would have to say either medievia or WCIII
wciii because the editor is so unlimited, the strategy so easy yet so deep, and the graphics so good even now
medievia for pure funness, and never getting stale, and being a great rpg
medievia is proof that graphics do not make the game, go to
www.medievia.com and join up if you have not already, it is a text-based rpg which uses a dos-like client program to connect and interact