My all time favorite is DD. I was like 11 years old when I buyed that game but the box looked so epic that I wanted it. Such a great world, so many quests and as of today I haven't found a game that could match up DD. Oh, and the addiction level is beyond all proportions
(Only a few years later I found out that the game was from a Belgian studio. Aw yea!)
And the music is just Amazing! And that counts for DKS aswell!
Through the years i've became an FPS gamer and less RPG player. But I did played some and here are my favorites:
I haven't tried fallout yet. Going to play it in the summer vacation when I got more time. Never tried a fallout game... Same counts for Fable. And Beyond Divinity. :x
Elders Scroll Oblivion: I played it a year ago but for some reasons I wasn't a big fan of it. Didn't played it that long though. Might give it a shot again this summer.
Dragon Age 2: Well they screwed up pretty bad. I don't even know how I played that for 5 hours. A whole different game compared to the first one. It missed the DA1 feeling.
Oh Two Worlds II: That was a pretty good game imo. But it was getting repetitive, haven't finished the game. And it had some annoying bugs (horse riding).