I've completed about 5 adventures of the 40-ish I've probably played. I think that says a lot on how picky I am (if I haven't expressed it enough in the past
)
The ones that I can think at the top of my head:
Broken Sword I & II
Grim Fandango
Discworld II & Noir
Still Life
Myst I & III: Exile
errrr...