Starcraft is on my list =) ! It's one of the first video game I saw, when my older brother was playing it. Since, I often play it.
I'll also put Diablo II in the list too. Even if I don't usually play hack'n slash, I can't get enough of it =). I think the game that stick the most are those who let us express ourselves so we can "digest" the game and make it our own.
What do you think fellers ?