Robert at Zeboyd Games
Banned
Where is Quest for Glory series?
Article specifically said that the Quest for Glory series is awesome, but they're counting it as more RPG than Adventure game.
Haven't played a lot of the games on the list, but Day of the Tentacle is my favorite adventure game that qualifies (my favorite adventure game is Ghost Trick but that's not on PC).
I replayed Space Quest IV just a few weeks ago and I really don't think it holds up very well. The puzzles are weak, the game pads itself out with several random death moments (moments where you're trying to avoid an enemy with a random movement or firing pattern), and outside the central joke of tying time travel to game sequels/prequels, I didn't find it that funny. But then, I've always been a heathen who prefers SQ5 & SQ3 to 4.