I really liked it! The CGI was really bad in points, but I mostly forgave it because of the surreal context. Except for maybe the bad CGI at the end, that was harder to forgive. I also couldn't get out Ezra Miller's various crimes out of my head completely during the movie. I did for a lot of it, but not as much as I had hoped lol.
Still, I really liked it! I thought the story and acting were great. The cameos were enjoyably nostalgic. The heroes got to do cool action stuff while still keeping the enemies intimidating and a threat. And it was pretty funny while still managing to maintain a lot of heart. It's hard to do stuff with the Flash because he's so OP, he has to be pretty dumb to not trivialize every encounter, but they made the battles and action scenes work. I'd probably rate it higher than others who are bothered by the CGI or other personal scandals from the cast, let's say an 8/10.