Ut2k4.
Yea i know UT is better but Ut2k4 has so many mods and maps and modes that i really cant foresee when ill be putting it down.
Diablo 2.
Had me addicted for a good year or 2. Then every few months when i get playin again ill be addicted for a month or two.
Warcraft 2.
Played it for years and years before i got tired of it.
Rise of Nations.
Havent stopped playin it since the day i got it. Yet to try rise of legends though.