GOTY 2011
Let my quickly preface by acknowledging I'm only posting my top five games this year. Though I've actually played more than ten new releases if I were to include as many as ten in this list that would still be most of the games I've played this year, and I don't believe that's very conducive to producing a list of the best games of the year, hence only five titles.
UPDATE: Now with a 100% more Bastion.
UPDATE: Now with a 100% mode Deus EX: Human Revolution.