Mark Strong doesn't fit my idea of Sivana, at all, but I think he's good enough to surprise me. Now I'm thinking of how cool he could have been as Lex Luthor, but BVS didn't deserve a cool Lex.
He was such a good choice for Sinestro in such an underwhelming movie, too. I really hope this fares a lot better. I've wanted to see a Shazam! movie for a long time, long before Johns' reboot which they'll probably base a lot of it on, and if this movie doesn't hit, I don't foresee second chances.