Comment There are a few (Score 1) 382
I'm probably on the younger end of the scale according to /. - however my list would personally look like this: I don't think games should be included if I wouldn't enjoy playing it today. Good games should traverse time with ease, time is a true test of a games fundamental design.
Guitar Hero (perhaps controversial, but its phenominal success and light hearted fun captured millions)
DotA (wc3 mod, genre defining anyone?)
Half-Life (could include Counter-Strike here)
Pokemon (red/green, hand held adventures)
Doom (or Quake, I had wolfenstein, but I believe Doom was more fun)
Starcraft (or Dune II, hard one... personally I love Dune II, but the fact SC is still played today speaks volumes)
Morrowind (3D RPG)
Streetfighter II
Civilization
Super Mario Bros