I loved how the batman was portrayed in the movie. Unlike Nolan's movie, I would say, this is the real batman. The batman I imagined. Again, you can argue there are infinite universes so, any version of batman are available.
But, the key difference i found was, Nolan's batman(trilogy) is portrayed as a hero for the audiences and he is a villain for the Gotham and it's citizen. While, Robert's Batman, for the audience is a dark, gloomy Bruce Wayne who is after revenge. He doesn't care about anything except for the revenge. Of course within the boundary of law. And, He is a hero for the Gotham and it's citizen.
Robert's Batman doesn't give the hero vibe we've been seeing from other superheroes and the movies. He isn't like Iron man or Spider man or Even Superman and Flash. He seems gloomy, dark, character who people don't seem to touch like typical hero.
I loved the movie. It was worth it. I doubt people will want to see Ben Affleck as Batman anymore.