If we balanced it on pure cultural impact (as a previous version of this story did), you would go with Attack on Titan.
Listen. The 2010s are impossible to crown, because the followed the end of the 2000s and swelled into a Golden Age of anime, through which we are still living. If I chalked it up to my own personal tastes, a little-known gem called The Tatami Galaxy could run away with this decade. If we balanced it on pure cultural impact (as a previous version of this story did), you would go with Attack on Titan. But instead, let’s go with a show that almost anyone who sees it immediately agrees is a goddamn jewel: Mob Psycho 100.