It's not cookie cutter, it doesn't rely on witty one-liners. In Marvel's Avengers, they successfully took established characters and made a compelling and cohesive story.
In Zack Snyder's Justice League, they not only told a compelling and cohesive story, but they also did so while introducing three new characters (Aquaman, Cyborg, and Flash) while at the same time establishing them as fully fleshed out characters you truly care for and want to see more of.
In short, it's a masterpiece of a movie. More so than any other superhero movie out there, ZSJL delivers a powerful story with interesting characters who each have a chance to breathe.