Just Cause 2 - It's an open world game that offers something genuinely new to the genre. The parachute and grappling hook movement system is amazing as is the way you interact with vehicles. Also giving you an entire country to roam around in (even if a lot of it is copy and pasted) feels absolutely huge compared to most sandbox games.
Scott Pilgrim vs. The World: The Game - The retro graphics, soundtrack and combat all just feel right. It's not a classic beat 'em up but if it had appeared in an arcade in the early 90's nobody would know the difference.