Agnostic atheist here. If you twisted my arm to choose something I'd make a religion out of this story [http://galactanet.com/oneoff/theegg_mod.html]("The Egg")
Other than that, I don't have any reason to believe its anything other than nothing, non-existence after we die.
It seems inconsistent on how they rank series. For instance, Starcraft 2 but no starcraft 1, which had a much bigger impact on the gaming world. Portal 2 but no Portal
But then they go and include all the half-lifes.