Watched this movie a couple weeks ago and enjoyed it. Wasn't over the top and the fact it's made from a book makes the books more appealing to read now. I might have to dive into them at some point.
The movie is pretty much about the sons/daughters of the gods. Which include Zeus and the gang. Someone stole Zeus's lightning bolt, another god gets blamed and a war is about to start. So a boy is blamed, they find him and the story begins to unravel on what he is and what all he can do.
It turns out to be an epic adventure for them and they even make it down into the underworld.
It's a neat concept for the way things are mixed into the real world but not quite sure how things are hidden and how regular humans forget seeing some things.
Past that, enjoy if you like a good story line with mythical gods.