1. Divine Divinity. Amazing RPG and has a stunning storyline. Graphics are fantastic. It's 2D but I LOVE it. It's from my country (Belgium) and not well known in others, but I love it.
2. Beyond Divinity. The continuation of Divine Divinity with again an amazing storyline. Graphics got even better (some worse imo) and there are more ways to play, more spells, more weapons, more quests, more special races etc.
3. Will probally be Divine Divinity II (which will come out soon). This will be in 3D and even better then the other 2
4. Baldur's Gates. I haven't finished the first one, the second one (CD) doesn't want to be read (guess an error, while it isn't second hand and new...) but I like it. It's very confusing when you are used to the ways of Divine Divinity etc, but I guess I'll get used to it.
5. Pff what have we got left? Warcraft III + expansion campaign is a bit like RPG, but It's not that good.
I tried Diablo II but it's so boring and the graphics sucks that I quit. guess Diablo III will be better.
So that's a bit of my opinion.