Well, the title basically asks by itself.

Here's my list:

1. Fallout
2. Deus Ex
3. Ultima VII
4. System Shock 2
5. Planescape Torment
6. Baldur's Gate II
7. Diablo II
8. Star Wars Knights of the Old Republic
9. Betrayal at Krondor
10. Mass Effect (I don't consider Mass Effect 2 to be really an RPG)

My top 10, in preference order:

- Diablo II 
- Planescape Torment
- Baldur's Gate II
- Fallout II
- Elder Scrolls: Morrowind
- Star Wars: KOTOR
- Deus EX
- Dragon Age: Origins
- Icewind Dale. 

1. Deus Ex (By Far)
2. Kotor II
3. Elder Scrolls III Morrowind

in any order

Neverwinter Nights and the plethora of expansions
Mass Effect 2
Oblivion
Fallout
Anachronox
Baulder's Gate II
System Shock II

I will say I haven't played planescape torment yet. Dunno why, I will some day.

Is that a joke, or are you really serious?

The only wetern rpg that i highly like is fallout 3.

I like to ask, how many RPGs have you played before Mass Effect 2? (Other than MASS EFFECT 1)

But, I wouldn't call it a pure shooter either. Like I mean, It could be called a "hybrid" or shooter-rpg, or shooter-interactive story, shooter with rpg elements. Or something else. One name leaves the rpg out. So i think it walks a fuzzy line. And thats the problem with trying to categorize some games.

Just my personal opinion. And I love the game. But OT i already listed mine.

Edit: I just bought planescape torment. Hopefully I'm not dissapointed in it, like I was with "the best JRPG/RPG ever" it's name is a secret to avoid disaster.

i wish more WRPGs exist, i am really getting tired of Fallout 3 likes (no offense, i only liked the old ones)

Haven't played very many, so I'll just do a to 5 (no particular order):

Morrowind
KOTOR
The Elder Scrolls 4: Oblivion
Dragon Age: Origins
Fallout 3

I will make one. it will be best ever!