There have been many games released this decade, and some of them are masterpieces. Here are the games I like most from each genre in 2010's:
First-Person Shooter: BioShock: Infinite
Third-Person Shooter: Uncharted 3: Drake's Deception
Hack N Slash: God Of War III
Simulation Racing: Gran Turismo 6
Arcade Racing: Need For Speed: Most Wanted
Survival Horror: The Last Of Us
Stealth Shooter: Metal Gear Solid: Peace Walker
Western RPG: The Elder Scrolls V: Skyrim
Open-World Sandbox: Grand Theft Auto V
Japanese RPG: Pokemon: Black/White