DC/WB has to be careful. They clearly have to make their movies more inclusive, but at the same time they have to differentiate their stuff from Marvel. I'm sick of the Marvel formula personally, but their films do have a lot of success. However, I know a lot of people were disappointed with Age of Ultron because it felt like a rehash of the first Avengers film. And what did those movies have? A throw away villain and a bunch of minions, and Justice League looks like it could be going in the same direction with Steppenwolf and a bunch of parademons.
WB has to find a way to give their films a little bit more levity, but while making their movies feel different, which will be difficult. Flash for example is a far superior character to Quicksilver. Even most Marvel comic fans would probably attest to that, but Fox has already given people a great Quicksilver (who was more like Flash than Quicksilver in terms of powers, and he was funny, something Quicksilver isn't in the comics). So anything they do with Flash will be compared to Quicksilver. Likewise Batman is going to get compared with Ironman.