I didn't think Man of Steel was bad, but it did disappoint me. I thought it was mediocre. There was so much that even I thought they could improve on. For example, one thing I really wish Snyder had done was use more natural lighting/colour. The costume used for Superman's role was really beautiful, and I think the under-saturated colour ruined it. If Snyder had used more natural colour for Man of Steel, for Batman's scenes in BvS, they could have had a bleaker colour and lighting to them. What would this result in? Easy and excellent juxtaposition between the lighting in Batman and Superman's scenes. I digress...
I don't think Jason Momoa is exactly what I think of when I imagine the Aryan-esque Aquaman. I don't mind change, though, and I did like him in Game of Thrones. On the other hand, I am thrilled and excited for Jesse Eisenberg. I was initially... interested, I suppose. I thought he was a curious choice for Lex Luthor. Now having seen the trailer, I have high hopes for him as Lex. I am excited for his part alone.
I think they need a better director than Snyder. God knows there are far worse than Snyder, but for an excellent movie, I think they need someone better. I have however heard that Chris Terrio is re-writing Goyer's original script. which could really make this movie excellent. He's the only reason I have any expectations. I personally think Goyer's writing is so-so, but he is quite familiar with DC lore, isn't he? If he writes an initial mediocre story, then a better writer improves it, it could make for an enthralling film. After all, this is what happened with the Dark Knight Trilogy.
Overall, I expect the movie will be good -- not great per se, but good.