I think that Cyborg and Flash were off the mark, as far as portrayals. Cyborg is part machine, but he considers his humanity to be his greatest strength. (Teen Titans!) Flash was just the polar opposite of what he needed to be, personality-wise.
Aquaman is NOT Roman Reigns. I actually came out of Justice League liking Aquaman.
Batman's role was limited here, but he's a man among Gods. He should be limited. I still fucking hate that his power is "I'm rich."
WW is amazing. Just fucking amazing.
Death was the best thing to happen to Superman. This was the first time we got to see Superman be what he should have been this whole time. He saw that good needed to be done, and he did it. And he wasn't a prick.