I quite enjoyed the Flash. Keaton's Batman was undoubtedly the highlight, and I liked Sasha Calle as Supergirl, though she didn't actually have a lot to do.
CGI was ropey a lot, though the director has said that it was supposed to have that look. Maybe, but uncanny valley is a weird intention to have.
Some bits were underwhelming, and there were more dumb bits than I was anticipating, but overall I think it was a good film.
7/10