Pixel article discusses classic game 'ennui'

Having grown up in the era when gaming was still quite young – I remember getting an NES before I even got to preschool – I found it easy to look back at the games behind me.  By that I mean Pac-Man, Galaga, even ET for the Atari 2600 (wish I could still find that charmer; it's somewhere in my closet...).  I couldn't begin to imagine, though, trying to tell a child who grew up with Halo that Wolfenstein 3D used to be a monumental achievement, and incredibly fun to play at that.  And let's say I could, and the kid enjoyed it, and then played it over and over again...then what?  I regard Super Mario World as a classic, but I can't play it without being bored out of my mind, beating the star road with my eyes closed.

Pixel, a feature from GameSpy, has a write-up on electronic ennui, which is to feel jaded about classic games simply because you've played them too much to remember why they were so great in the first place.  It's a fun,
quick read, but it also has me thinking – how much does multiplayer help in a game's longevity?  It seems to me that Starcraft is still being played en masse online, yet the game is almost a decade old.

What classic games do you have a hard time playing?