While this is a very subjective matter, i must say that i'm genuinely surprised that
no one has mentioned Fallout yet. While the graphics aren't something to brag
about, the gameplay and story is amazing.
I don't know much about RPGs though, as i prefer shooting games and so on, but
i know enough to say that Fallout is a great game.
But apart from that...
...
I dunno. Haven't played any truly epic RPG for a while now.