No spoilers.
Good, not great. The the "secret" villain I felt, was not the way to go for a first movie. I wish Luthor found a cleverer way to match him. Also, his command prompts (that was inputted by someone else and then had to be executed by the villain ) were no way faster than a speeding bullet. The engineer being too overpowered. Gunn does realize Kal-el does not need to breathe right?
Good acting, inconsistent script, some non faithful and questionable direction choices. I know they are trying to change the tone for the DCU movies but it seems off for arguably the cornerstone of the franchise. But what the hell do I know.