Personally I thought it was just "fine."

Probably one of the best reviews I've seen for it is "Superman acts like Superman" which is a good critique, but imo that's one of the few things going for it.

I do feel like we needed a little more Superman in the Superman movie, and I feel like we didn't really see Lex's motivation other than him just saying that he hates Superman in almost every scene he's in. I also didn't like the overuse of the "Superman Theme" for practically every little thing Superman did; it got to be too much, like the Avengers theme playing whenever they do something slightly heroic in Endgame. By the end of the movie, it felt cheap. Compare it to movies that John Williams actually did score: Jaws, Star Wars, Indiana Jones, etc.; they all have just a couple "themes" for their characters and the rest is fantastic score that whenever you listen to, you can pinpoint the exact scene it plays. You don't have the Star Wars theme playing whenever some of the main cast does something heroic in any of those movies. Could you imagine how fast how old it would get?

I did like the very comic-booky feel of the movie, although it also felt very "James Gunn" if that makes sense. Especially the fight scenes.