Batman V Superman: 10 Reasons We're Worried For Justice League
3. If Snyder Ruins Darkseid, We Riot

Batman v Superman pretty emphatically states that Darkseid will be the villain for Justice League...which is both exciting and terrifying. Consider that Batman v Superman didn't exactly do a terrific job with a baddie as simple as Doomsday: the iconic supervillain was transformed into a generic CGI cave troll for an unremarkable third-act battle where he was possibly wiped out for good.
Darkseid is a far more complicated villain to adapt to the screen well, and though he arguably also presents Snyder and Terrio with more possibilities moving forward, there's not much reason to believe they'll get him right when Doomsday was so thoroughly underwhelming.
Yes, Man of Steel did a fantastic job with General Zod, but that was the work of David S. Goyer, who isn't helping write Justice League.