This movie is just sort of a lark, and more interesting as [a sign of] where the genre is going. 
Black Adam is nothing more than a splashy two-hour coming attractions reel for future motion pictures.
Cheaper, trashier, perhaps even dumber films have been saved by the presence of Dwayne Johnson. So why is DC’s latest so doggedly immune to the redemptive power of the Rock?
Black Adam is what happens when artists say they want to go dark but don't really have the stomach for it.
I found it to be completely inert and lifeless, especially his character.
Dwayne Johnson is at his most uninteresting as an ancient Egyptian bodybuilder who must learn (like Drax in Guardians of the Galaxy) that sarcasm is cool and that (like Arnie in Terminator 2) torture and murder is not.
Will critics love it? Absolutely not. But will you love it? If you love big, loud popcorn superhero movies and The Rock? You bet.
Black Adam lacks the spark DC was looking for.