tricksterben: Thanks everyone for the responses so far. I've read them all and have tried to take everyone's opinions in when editing the list.
Thanks for being open minded! It's a better list now. There are still some huge omissions, though.
I still recommend condensing the major series like Zork 1-3, King's/Space/Police Quest, Monkey Island, Gabriel Knight, Telltale Complete Season Pack, etc. Like you said, you can't fairly single out one game in a great series without mentioning the rest, and condensing them to one entry each would free up a lot of room for other deserving games. Not really fair to give weaker entries in a series their own entry just because they have talented brothers.
There are enough Myst-style games not on the list to justify listing them separately as first-person adventures. They all tend to have a different flavor than 3rd person, whether it's point-and-click or steering someone around the screen with keyboard. So Gabriel Knight series would get a third-person entry, the Zork graphical adventures and Journeyman Project series would be first-person, Grim Fandango would be 3rd person, and Tex Murphy series would be somewhere in the middle, although you could grandfather it into 3rd person because of its point-and-click heritage and all the traditional 3rd person cutscenes. If you made that split, you could do the same for text adventures. More work for you, of course.