Well which one would you have replaced? That's the point you can say something like that about the stuff in there. All of these games were real game changers - stuff that has stuck in the minds of millions of gamers over decades.
For me Doom is likely the weakest candidate in there but it's hard to argue with its influence on gaming over the years as well. I can't really argue with Tetris, Pac Man or even Pong simply on history. WoW was and remains the biggest game ever from what I can tell. Finding it hard to argue against Mario as well by similar metrics.
Well, for starters:
Pong was cited for its influence on popular culture upon its 1972 debut, as was Pac-Man (1982) and Tetris (1984).
3 games awarded for the same reason? Where there are only 6 places available? That's quite bad.
The original Elite definitely deserves a place in this list, it was a real game changer, almost unbelievable experience. Dune 2000 was also quite a shocker, it opened gates of real time strategy games. So I'd definitely replace 2 out of those 3 quoted games with Elite and Dune 2000.
Another questionable one is Doom. Awarded for violence? I can understand the modding part - fair enough.
There are many more games that were quire revolutionary or original enough to be included in the list. Transarctica comes to mind, an extremely unique game that has no equivalent to this day. Not a single game even attempted to recreate the experience. What about adventure games from Lucas Arts? They were absolutely brilliant. The quality of writing, especially in The Secret of Monkey Island is stunning.
I think that The Best Of list of games needs AT LEAST 20 places, simply due to the sheer amount and variety of games that were release over the years. And it shouldn't even be 1 is better than 2, just an equal list of 20 best games ever, in terms of cultural influence, industry change, uniqueness, creativity, technology (relative to the times it was released in) etc.