Dark Souls is the greatest game of this generation.
Debate me if you've finished it and think otherwise.
No other game has an atmosphere quite like it. It's a true videogame in that you learn through failing, it's an homage to the unforgiving retro games of the early 90s and late 80s.
Completely innovative in every way. It's a single player game that is multiplayer while you go through it. You'll be in a cave with a fork in it and you'll read a message on the ground from another player who tells you to either go this way or that way. Or you'll be 10 inches from your bloodstain only to be invaded by another player and killed.. only to lose them all.