Thought it was okay, not great, but a definite improvement compared to the Whedon cut.
Some of the issues I had with the movie aren't even its fault. The future scenes, which were obviously meant for future installments, now feel tacked on, mostly because it doesn't look like the story will be picked up (if this is popular enough maybe, but it's big maybe.) The first Martian Manhunter appearance I felt was pointless, and left you wondering well why isn't he helping, they probably could have kept it to the last scene or a post credit scene.
On the plus side I really liked the additions for Cyborg as it fleshed him out and made him a more complete character.
Overall I don't think I would have liked this in theaters, but on HBOmax or as a Miniseries it works. 7/10.
If you trimmed up or got rid of the the future scenes, shortened the epilogue (which seemed LOTR style in length), and made a few musical changes it would get a solid 8 or 9 from me.