It's all about vision.
Anthem never had a vision. Casey Hudson left the company in 2014 and didn't come back until 2017 after the studio had gotten nothing done in that three years because no one could be decisive and figure out what the game was supposed to be. The one coolest concept in the entire game, flying, was iterated and deleted time and time again until it was almost taken out indefinitely. Mark Darrah was then put in charge of the game with the mission of "ship the game" and that's that.
The DCEU also lacked a vision. Warner Bros. had a "ship the cinematic universe" attitude to catch up to Marvel, trying to do in three/four movies what Marvel did in six. Instead of doing Man of Steel 2, Wonder Woman, Aquaman, Flash, and maybe Batman before Justice League, they just showcased Wonder Woman (twice) and brought in everything else with Justice League. And at the helm of the universe was Zack Snyder, who's proven himself to not truly understand the characters he was put in charge of, leading to the mixed reactions the movies have gotten.
The MCU owes its success to Kevin Feige and the other talented people at Marvel who have a vision for the universe and worked tirelessly to see it executed well. They have a fantastic understanding of the characters they're working with and the talent to know how to tell that story properly. Not every movie is a slam dunk, but when you have thousands of people working on these projects and hundreds of millions of dollars being spent, having everything be on the same page with that vision and have it turn out as well as it has is absolutely the greatest achievement in film history. Because we have the DCEU and Dark Universe to show us how it can all go wrong.