Diablo 2 if you count that as an RPG - no other game has been played so much by me that I wore out the mouse!
the games that just absolutely captured my imagination when I played them. Oblivion, Morrowind, Fallout 3 Final Fantasy 6 and 12 Destiny of an Emperor
It depends on the definition of "RPG" you're using. On the one hand I'd have to go with Ocarina of Time. On the other I'd say Skies of Arcadia.
This thread is full of noobs >_< It was shown in last month's issue of Scientific Proof magazine that Planescape: Torment is by far the greatest RPG of all time.
Tough choice, I would have to say Star Wars KoTOR, or XenoGears. Ask me to chose between the two and I just can't do it. KoTOR:TSL would have made it in but I like the games I play to be, you know; Finished.
Hehe. When I was a young lad, I got it for free with a subscription to Nintendo power. I hate poison swamps.