Well if this is true...point on Steppenwolf...yeah, he doesn't seem like a great choice. But I'm glad it's not Darkseid, whom I think should be saved for later.
This bothers me about the same problem the first Avengers movie had with its main villain...Loki, who is not a good villain in my opinion, and for the Avengers no...don't get me wrong, I think Loki has proven make a worthy antagonist in Thor: The Dark World, but as a main villain for the Avengers...he wasn't intimidating. He was just a jealous brother and vengeful. Eisenberg's kid Lex is like an example of a much worse version of Loki.
Don't get me wrong, Loki isn't a terrible villain. I think he's okay, but the point in the first Avengers movie was to bring the iconic characters together...that being said, I wish Justice League could do that and use a better villain at the same time. Ultron made a better villain. Most of Spider-Man's villains were pretty decent. Loki was kind of below average. Even Zemo was better, at least to me.