Surprisingly readable. I picked this up because I was travelling and it was the only paperback on the shelf that I thought I could stand, and I will admit my hopes weren't high. I've read a lot of stuff about the Greek and Roman gods that were just bad. Writers who obviously know little about the gods of classical times beyond their names and some sort of vague crib sheet description. But Riordan actually did know the pantheon, and still was able to bring it into the modern world in ways that were kind of funny - Ares doing Brando on a motorcycle for example. I saw the plot twists coming from a chapter away but that's okay, it wasn't written for adults, and at least it didn't insult my intelligence or attack me with terrible prose. I might look for the next one if I need another plane ride read.