That seems like an odd order and an odd statistic to measure.
It's not based on sales, and it has some sequels ranked higher than the original games that influenced them. I mean, why is RE4 ahead of the original, but the original GTA is ahead of GTA3 or Vice City which really started the big craze for the game?
Also, Halo isn't nearly as influential as Doom, Wolfenstein, or Goldeneye. Doom and Wolfenstein were the first two big FPS and Goldeneye was the first to show it could work as a multiplayer game on a console.
And FF12 that high? Really? For what?
This makes no sense.