Get this game over Killzone 2
Get this game over Street Fighter IV
Get this game over Resident Evil 5
Get this game right now! Sell your soul to the Devil if you have to.
GET. THIS. GAME.
(Disclaimer: Author of this post will not be held responsible for any inherit bias in his view of the best game of this generation)
Edit: Don't listen to Kantor, his opinion is extremely bias and should not be trusted: Get this game over MGS4.
*Puts halo on top of own head*