Humor is good when it suits the character or situation. Age of Ultron is, to me, an example of how just bad it gets when you write all characters with the same voice. X-Men DoFP or at points Civil War is largely balancing it well. Say, Black Panther is never cracking jokes in the film. During dramatic beats Wolverine isn't making dick jokes.
In truth I don't know what to expect from JL. For all the assumptions of a 180, Cyborg and Aquaman seem serious. Batman's humor is along the lines of what I'd expect from Batman. I saw Flash as the only overtly funny character. We'll see how it pans out. There's not much to judge it on now.