Since I heard about the casting of Ben Affleck, my mind has started to pop out ideas of how to make a successful DCCU. There are three steps to making a successful one.
First step: Don't go right to Justice League movie, do solo's first. A lot of people will say you are doing the same as Marvel but that is really the only way for it work and make SENSE. Imagine you go right into a JL film after Batman vs Superman, The Director has to explain at least Wonder Women's, Flash's and Martian Manhunter/w origin. That will take up a good chunk of the movie and leave us with a crappy movie. DC already started with MOS now they are making Batman vs Superman. I think this is a good move because it introduces the new Batman and already starts his and Superman's relationship. After Bat vs Supes a Wonder Women and Flash movie is needed. The reason they are needed is because there has never been a movie about them so the GA knows nothing about them. Release WW in 2016 and Flash in 2017 (maybe 2016 if WB really wants to get a JL film in 2017) You don't want to take up a chunk of the audiences time in JL by explaining them personally instead the JL movie should be a origin movie for the actual TEAM.
Step Two: Cast good actors in roles but not good actors who will only do 2 or 3 films. Now I don't mean they have to star in ten films but they should be willing to star in their own characters trilogy and a JL trilogy. What WB also needs to do is cast older famous actors in supporting roles, kind of like Tommy Lee Jones in Captain America and Anthony Hopkins in Thor. Maybe start of doing this with maybe getting Robert De Niro as Carmine Falcone or Harrison Ford in a role. That will get more audience members and also will probably make you movie a little better in acting. Also now that Ben Affleck is Batman this opens a lot of doors for casting. He could possibly bring in Matt Damon, Jennifer Gardner, Jeremy Renner etc. That will really help your film because you will have really famous people in your movie and that will get more audience members. He also most likely direct the Batman movies so that will also attract many actors because he's got two oscars!
Step Three: Hire Directors who know something about the characters and has passion for the subject. Having a Director that knows something about what their making is so important. If you don't hire a Director like that then you end up with a bunch of Green Lantern quality movies (you don't want that!) My list of Directors would be like this:
Superman and JL: Zach Snyder
Batman: Ben Affleck ( He is an exception)
Wonder Woman: Katherine Bigelow
Green Lantern: Joseph Kosinski
Flash: Rain Johnson
Martian Manhunter(if they want to) : Ridley Scott
Well those are my ways to building a successful DCCU. Hope you like if not please don't be cruel it is my first time but I am fine with constructive criticism. THANKS!