Wow!!!! What a thread!!!
Ok --- here's my two cents.
I think I'm a real "Pollyanna" when it comes to gaming -- I try to "like" or "enjoy" the experience as best I can from the begining.
But there times --- that I have to say --- there are a few that I honestly didn't. Not because of having to tweak my system or add patches, mind you --- or the puzzles are too difficult, etc.
The games that most come to mind are:
Midnight, Nowhere --- just not my cup of tea at all ---
Chateau 'Dor --- I agree that it was tedious (actually put me to sleep)
but the worst -- had to be "The Scroll" --

just ask Syd!
I also have to say that I really liked A Fork in the Tale -- I had a blast with it.
A Quiet Weekend in Capri --- was brilliant for me -- I had a great time with it.
Different Strokes I guess.
Inferno