Brosnan as Fate is pretty much bulletproof casting. There's nothing to dislike there.
I was interested in Hodge as Carter because I only knew him as the funny guy on that dumb Leverage show. I had no idea how he would come across, but he seemed confident, tough and imposing. You don't get a ton of him here, but there was a lot more gravitas than I knew Hodge had. Outside of the overly X-Men esque setup, I think the JSA looks cool as hell.
As for Black Adam, it looks like....well, it looks like the Rock doing his self-indulgent, generic "badass" routine. But if the movie is fun and the JSA kick some ass, that's all I'm really hoping for.