I played two point-and-clicks all the way through. The Dig, as briefly imaged in Gamedamage's first TV show, and I Have No Mouth And I Must Scream.
The Dig: Wander around an alien planet with absolutely no clue what's going on, missing essential stuff and having to travel all the way around it fifty billion times and then give up and consult a walkthrough.
IHNMAIMS: Based on the book by Harlen Ellison. Wander around bleak, computer-built environments as you fully appreciate the maniacal mind of the omnipotent AI that's slowly torturing the sanity from five individuals. A rape victim who is afraid of the colour yellow is stuck inside an egyptian knock-off pyramid and forced to confront a replica of the rapist in one point of her adventure. A suicidal loner who blames himself for the death of his wife is constantly haunted by the guilt, and ways to kill himself, which never work. A former brutal drill sergeant is turned into a stupid, ape-like creature who's forced to endure the worst of physical tortures, starving from months of not eating anything, is sent to a village where he cannot eat the fruit, and is forced to try and eat anything he can find most of which hurts him.
I could go on, but I doubt anybody's actually played it.