Totally my preferences, based on how much fun I've had playing them.
10. DQ VIII - PS2 - playing it now, it's a lot of fun
9. Devil May Cry - PS2 - even though I can't get very far, it's just an awesomely cool game
8. FFX-2 - PS2 - thought the gameplay was better than FFX, and FFX was like a badly written teenage soap opera - raging hormonal angst and no subtlety
7. Harukanaru Toki no Naka de 3 (unknown Japanese sim game) - PS2 - not original but fun and pretty (it's for girls)
6. FF VII - PS
5. Radiata Stories - PS2 - people complain that it's too short, but it's so well-done and fun to play
4. Onimusha - PS2
3. Mortal Kombat II - SNES
2. FF XII - PS2
1. WoW - PC