This is hard. Very very hard. So many games; so little room. From best to worst.
Superb
1. Grim Fandango
2.Psychonauts
3.Monkey Island 3: The Curse of Monkey Island
4.The Elder Scrolls 3: Morrowind
5.The Longest Journey
6.Heroes of Might and Magic 3
7.Final Fantasy 7
8.Monkey Island 2: Lechuck's Revenge
9.Monkey Island 1: The Secret of Monkey Island
10.Monkey Island 4: Escape from Monkey Island
Still really Good
This was really hard. My mind was split with love for each game, and I had trouble placing them in order. That order could change depending on which game I'm playing, but that's the best estimate I can give.