8 Critical Mistakes The DC Film Universe Has Made
7. Versus/Team-Up Movie Before Solo Movies
Warner Bros. opting for the team-up movie then spinning off into their solo slate may have felt like a backwards decision to some, but there's no reason to assume it couldn't have worked. The problem isn't necessarily with that choice, but the ramifications of that choice on future movies.
The problem with introducing so many characters at once is that audiences struggle to latch onto any one of them, and it's harder to do each of them justice. As a result - and completely unintentionally - a single character or a handful of characters could end up being poorly managed and poorly received, and that bodes ill for any future films in which they appear.
Lex Luthor, in particular, irritated plenty of fans, and there's a high chance he could put people off Justice League because of it. Gal Gadot's Wonder Woman wasn't a complete roaring success either, and if you didn't like her here, why would you pay to see Wonder Woman?
If the solo movies came first, more time could have been spent perfecting every inch of each character's portrayal. As it stands, Batman v Superman was a poor display for several of its major players, for the simple fact that they had little room to breathe.
Solo movies first isn't 'copying Marvel' - it just makes sense, creatively.