The list definitely skews towards more recent games, which I think entails the respondents skewed relatively young. Recency bias may come into effect as well. We don't see a 16-bit game until Chrono Trigger at #11, there's not an NES game until Super Mario Bros. 3 at #37. In total, I counted only three NES games in the Top 100, and only five SNES games. The highest-ranked Genesis game was Sonic 3 at #159. The only games from the Golden Age of Arcades that I saw were Galaga and Donkey Kong (no Pac-Man!) and they were close to the bottom. So many classics are way down the list. I mean, how the hell else does BioShock Infinite and Destiny end up ranking higher than, Street Fighter II, Mortal Kombat II, Mega Man 2, Super Mario Bros., or Doom?
I'd really like to know what the age demographics of this poll were and their platforms owned. If I had to venture a guess, there weren't a ton of grizzled old Gen X vets like me that have been playing since the 80s.