(Percy Jackson Book fans)What was your thoughts on watching Percy Jackson and the Lightening thief?

Being a huge fan of the book series, I rushed to the movie on opening day. I was excited, but expected to be let down somewhat, because most movies that are based on books change some things or just aren't as good. However, after seeing the film, I was beyond disappointed. The film clearly wasn't even TRYING to be a solid adaptation. Several major plot points were wrong or just outright forgotten. The casting annoyed me in that hair colors, eye colors and such were wrong. Maybe that's a bit trivial, but it still tends to bother me. Maybe the movie wasn't as bad to those who weren't such big fans of the book series?