Gosh inFAMOUS 2 was just great.Gameplay was near perfect and the endings were amazing.
ENDING, the evil ending did a lot to make the player feel guilty for their actions.
I can't really name one or even two games the "best of the gen" since this generation is not over yet. So far though, a few notable ones that definitely aren't gonna be forgotten by me are
Bioshock (1, 2, and hopefully infinite will be good as well) - Masterful, intricate story. Possibly the best story this gen.
inFamous (1, 2) - This is the game that made me want a PS3, I'll always keep it close to me.
Uncharted 2 and 3 - Uncharted 2 is possibly the best TPS adventure game for the PS3. U3 is one of my favorite games in general so yeah
LBP (all) - Funnnnnnnnnnnnnnnnnn as **bleep**
PSABR - How could you forget this game?
Heavenly Sword - VERY overlooked game, but nontheless, still amazing.
Sly Thieves in Time - I don't care, this game will be my favorite game of 2013 unless Tomb Raider or TLOU beat it
Heavy Rain - One of my most interesting experiences with gaming was this game, not gonna forget it