Haven't we heard this phrase before? There's always so much debate over which videogame is the proverbial Citizen Kane of the industry, as in which videogame can be recognized by the most people as being "the best." for those who are not film buffs, the movie Citizen Kane is widely regarded by professional movie critics as the best film ever made, and as such you can't really BE a professional film snob-- I mean critic, without agreeing to this one unwritten rule amongst the Oscar-loving film community.
There have been quite a few videogames that, whether coined "the Citizen Kane of gaming" or not, HAVE been praised as being one of the best, if not the best, ever made. Some of the more popular choices for this controversial category have been Legend of Zelda: Ocarina of Time, Super Mario Bros. 3, and ABC News even did a piece in collaboration with Michael Thomsen from IGN giving a detailed analysis claiming Metroid Prime to be the Citizen Kane of videogames, directly comparing their themes and stories.
Consider this video by Anthony Burch to be in line with my feelings about not only Metroid Prime, but ANY game being called "The Citizen Kane of videogames."