I thought that Percy Jackson and the lighting thief was a really good film as they tried to modernise the idea of the Greek Myths and they had some of the better known villains as the bad guys.
I liked most of the cast as they played their part very well as i thought Sean Bean played a very good Zeus and the main cast played their roles off perfectly, However i also enjoyed Pierce Bronson as the Centaur Chiron or Mr Brunner Percy's Latin teacher, but i liked Uma Thurman as the Medusa as i feel she played that perfectly but i wished she had longer in the film. 1 thing i didn't really like was that Steve Coogan playing the part of Hades,1 of the reasons why i didn't like it was that he known for his comedy roles so i thought he couldn't pull the part off. Another thing i didn't like was that they made him wear leather, i think that Hades shouldn't wear leather he should have worn armour or something to say that i am king of the underworld.
The main 3 of the cast remind me of the Harry Potter 3 as Percy who is special because of his Dad is also special and you also have Ron in this movie but he is a Satyr but will also help even as far as staying in hell to protect his friends. Then you have Hermione in the movie but she is like Percy as her Mom is special which is different compared to the Harry Potter 3 but she has the knowledge which makes her like Hermione.
Th only thing i wished i saw in the movie was Cerberus the 3 headed guardian to the underworld as i felt that he was needed in the movie to improve the scenes in hell as you have other mythical creatures like furys the Hydra and even the Greek Gods but apart from that everything else was good
The Storyline of the movie was better than i thought it would be where as a boy discovers he a demigod as his father is one of the big three gods of ancient Greece Posideon. He needs to clear his name as he is blamed for stealing the lighting bolt from his uncle Zeus. I dont know how much the Movie follows the book it is based of. for all i know the film could have nothing to do with the book.
overall i enjoyed the film, but i would say study basic Greek Mythology before you watch the film if you are to understand the importance of the characters and gods.
you can read the book the film was based on to see if there was any differences between them