There are only two perfect things in this universe and neither are games; and that's Neil Gaiman, the greatest man to ever wield a pen, and American Gods, the greatest thing ever written with the pen belonging to the greatest man to ever wield the pen.
The closest to perfection in a video game for me would be Doom. I know people are going to laugh at me but Doom gets it right.
Was it hella fun? Check.
Did it revolutionize gaming? Check.
Did it look good when it first came out? Check.
Do people still play it online in massive droves and continue supporting the community 16 years later with new mods, engines, and online modes? Check.
Also, it WASN'T realistic. Screw Realism in shooters. I hate having to reload which always leaves me with my pants down for the next baddie around the corner. I hate fighting Nazis unless their deaths are over the top in a sci-fi setting (See Wolfenstein.) I don't want to solve some long mathematical puzzle just to get the action flowing. RUN AND GUN BABY!!!
I still love Doom and I download levels and maps every week and I'm in a clan for old school Doomers and I occasionally make maps as well. I also celebrate Doomsday every year and always look forward to Doomworld's Cacowards to get my hands on the best wads I might have missed.
I bet you $10,000 that in the next 16 years people will still remember, if not still play, Doom with fondness.