Not if you pretend Nitemare 3d never existed it didn't...
The three Hugo adventure games were some of the first adventure games I ever played. Classics... I liked them a lot, even if the text parser was annoying sometimes. Saying that the genre never could have made it long term isn't fair... adventure games were popular (as text adventures) from like the late 1970s through much of the '80s, then graphical adventures were popular until the mid '90s... I still blame Myst for killing the genre. Everybody copied Myst, everybody's games sold badly, everybody decided adventure games were dead. And presto, mostly low-budget European stuff excepted, they were. This has nothing to do with this thread, though... I'd say that the Hugo games and the Lucasarts and Sierra classics definitely are must-plays. Not necessarily all of them, but a good sampling at least.
The only thing about Halo that impressed me was that nine or ten minute 1998-1999 E3 Halo demo video, from when it was still a PC game (that video was awesome... the game? I never cared)... so I'd lean towards agreeing with this one, if just out of personal preference.
Hmm... I can think of a better answer, though. Ultima I-V (or so), Akalabeth, and the first four to six Wizardry games -- those classic RPGs which defined the genre early on but, by modern standards, are virtually unplayable thanks to impenitrable interfaces, huge complex maze dungeons with no ingame mapping, and game designs which seem specifically ordered to make you suffer...
... of course, there are people who actually like to play NetHack and stuff, and that game's as cruel or more cruel than any of those, but... I don't know, while I recognize their contribution to the genre, I just couldn't quite recommend that someone actually play any of the things unless they like suffering.