

I can imagine if the Ant-Man films were very serious like The Dark Knight films, with hardly any humor, and here's a tiny guy running around fighting bad guys.

With Ant-Man, the humor helps sell the theme really well. Aquaman sort of falls into the Ant-Man category for the theme being very far fetched, that it's tough to pull off without being a little cheesy, so it's a good idea for the creators to add in some humor to balance it out. I hear what you're saying about trying to make something unbelievable seem more realistic. Yes if only we could have a realistic, grounded movie about superpowered fish people living underwater.
