Let me specify. Ezra Miller was fine acting wise. The script having him play off himself for most of the movie sucked. Like I said earlier it should have been Thawne, with a different actor, rather than Dark Barry. Other than that I liked the movie. I was happy with the Supergirl stuff and I was even happier for all the Batman stuff. Hell, just seeing Batfleck in the blue and gray was awesome in itself. My 2 minor gripes were the CGI for Flash in the Speedforce, but knowing it was done for stylistic reasons, there is at least an excuse for that. Outside of the Speedforce scenes the CGI was on par for most shit nowadays. Also as much as I loved the Batman stuff, they went overboard with the Keaton nostalgia. He didn't have to hit every line from OG Batman movie.
The movie is top 5 in this DCU at least, with Shazam, Wonder Woman, Suicide Squad 2, and Aquaman.