1. Final Fantasy X (that's #1 including all genres)
2. Final Fantasy XIII (yes, I'm serious)
3. King's Field II (or King's Field as it's known in the west)

I don't know what would be after that.

1. Chrono Trigger
2. Final Fantasy 6
3. Suikoden
4. Suikoden 2
5. Breath of Fire 3
6. Breath of Fire 2
7. Final Fantasy 9
8. Grandia
9. Lufia 2
10. Dragon Quest 8

honorary mentions: most of Final Fantasy Series(everything before 11), Suikoden 4 and 5, Pokemon Series. Dragon Quest Series.

1. Panzer Dragoon Saga
2. Deus Ex: The Conspiracy
3. Earthbound
4. Chrono Trigger
5. Fallout 2
6. Skies of Arcadia
7. Knights of the Old Republic
8. Diablo
9. Final Fantasy VI
10. System Shock 2

1. Final Fantasy X
2. Mass effect 2
3. Final fantasy XII
4. Persona 4
5. Dragon age Origins
6. Final Fantasy VI
7. Dragon Quest VIII
8. Kingdom Hearts II
9. Demon's Souls
10. Final Fantasy VII

1. Gothic I
2. TES III: Morrowind
3. Gothic III
4. World of Warcraft
5. Fable I
6. Legend of Heroes III
7. Mass Effect
8. Final Fantasy IX
9. TES IV: Oblivion
10. Gothic II