1. Ultima VII: A large world to explore. The cities feel alive with interesting people and you don't have to fight lots of enemies in them. The game have the best dialogue ever. Others may say that the combat was weak but I found it excellent since every fight was quickly finished.
I completed it more times than I want to admit. I wish to replay it again but there is no point when I know every corner of the game. All other roleplaying games before it feel blasé compared to it.
2. Ultima VII: Yes it was so incredible that I give it the second place too
3. Ultima VII part II: Loved that one too, the same game engine but a new world to explore. Yes I felt really disappointed with Ultima VIII.
4. Gothic II: A fun interactive world to explore.They fixed most of the flaws in Gothic I, better dialogues, graphics and they added Khorinis! One of the biggest flaws was the terrible dialogue, compared to Ultima VII it felt underwhelming. The story was a bit weak too, the Sleeper had a master that is now threatening the world. I also replayed this game way too many times.
5. The Witcher II: One of the best stories ever told, fascinating characters and lots of rolepaying. I was not so fond of the combat. Too much profanity, especially the sex scene between Trish and the witcher felt way too low. After finishing the game I only wanted more of it. I have not had that feeling for years, usually after finishing a game it feels like a relief to that finally done.
6. VTM Bloodlines: I just love city adventures, throw in some vampires and a 3d shooter and you have a great game. I even admit I got a bit spooked when exploring that old hotel. Although some parts especially towards the ending involved way too much combat.
7. Baldurs Gate I: A better story than the second one but the sequel had a better polished engine and more interesting character interaction.
8. Kotor: The best Star wars roleplaying game. Intriguing dialogues and for once fun combat, perhaps because it's fast moving. I never anticipated the twist with Revan. This is the only game I actually felt bad when doing evil things.
9. Deus Ex: Good combination of 3d shooter, stealth and roleplaying.
10. Fallout 3 NW: Fun to explore the mojave wasteland and meet it's inhabitants. I really disliked VATS and never used it.