Yes, this list has more holes than Swiss cheese. Yes, a lot of series are over-represented. Yes, a lot of games are too high, too low, or don't belong on the list. IGN is dumb - this is known. But I don't know of a better source for a "top video games of all time" list to use, so here we are.
Plus both Portal games being WAY too high on this list, too many Halo games on the list, and practically every major Legend of Zelda, including several that were highly overrated. And Super Mario World isn't even the best Mario game, let alone the best game of all time.