This was an extremely good movie. I have read all of the books, and at first was frustrated since it hardly matched the books at all, but soon realized that since they obviously wouldn't be making any other movies in the series, they needed to take things out, change things, replace things, and much more, so they wouldnt run into unanswerable questions.
For example: Medusa, old ladies knitting socks, luke, ares, annabeth's hair, grover, percy's age etc. :D
Otherwise, they picked wonderful actors and I LOVED the movie!
(Annabeth's eyes were GORGEOUS---anyone agree?)