I agree with the mention of Tetris as both the pinnacle of its genre and a genre-defining game. IMO all other games mentioned are just a random selection. There are some games I like and others I don't like, but none of the winning games except Tetris strike me as being revolutionary for the genre they're assigned to in this article.
Pools of Radiance defined the whole D&D game genre for me. If you think about it, the combat system is still pretty much used today despite being in real time. POR has aged well and still playable for me even on the high resolution displays we have these days. Castle wolf and Doom defined the FPS shooter genre and then games like Elder Scrolls merely merged genres (arguably creating a new genre).
Someone mentioned Dune 2, it's the only RTS game that I have completed 3+ times in order to see all the different endings. Dune 1 was a better game but it's dune 2 that all RTS games borrow from in my opinion.
I also think Dune 2 lead the way. Dune 1 was a totally different type of game (primarily an adventure following the story of the first Dune novel IIRC, though it also had its strategy game elements), and it was developed by a different studio. Dune 2 concentrated on the RTS gameplay and paved the way for C&C.
I have to agree with you there, its not a bad list considering. Quest for Glory over Myst is an interesting selection. BG, Wizardry or Ultima 3 would have been my choice as a defining RPG but that depends what era you are in. Morrowinders may be the current trend but its certainly polite to pick Fallout. There is no arcade type category, surprisingly, Tetris is listed as a puzzle game. I would think Pac-Man's wife would shove everyone else to the side be they Invaders from outer space or bugs navigating their way through mushrooms. No simulation games either: Simcity, Sims, Flight Simulator, nothing. I guess its dead.