Many games are too boring to play to the end even once. They lack story, or the challenges are repetitive in nature (Shoot that alien! Now shoot that alien! And that must be an entirely different alien, even though it looks exactly like those I shot before it, but it's still moving!...)
It is an interesting challenge to see whether you still remember the solutions to all the puzzles in the LucasArts games. If you do, playing these games is like participating in an interactive movie, but often with way more alternatives. I still like exploring large and complex environments when I find the time. Leave linear first person shooters to the masses and give me a new Fallout, Wasteland, or Elder Scrolls. Zak Mc Kracken 3D?
The LucasArts games were made with love and programmed thoroughly. I mean, while many games in that era were difficult to set up, the LucasArts games usually scaled better with faster hardware and enjoyed patches for years, long after other manufacturers would have dropped similar games. Also, the philosophy of death-free play that encouraged explorative playing style without a gazillion load-attempt-reload. The LucasArts games still serve as an ideal that is difficult to reach for many productions even despite much larger costs.