Percy Jackson, by far. They changed the characters' ages, looks and personalities, completely changed the plot and butchered one of my personal favorites.
Hunger Games and Harry Potter I'd say are really close to the book compared to this^ trainwreck.
after watching eragon it made me not want to read the inheritance cycle and i thought my classmates who were reading it were stupid, i am so glad that i got bored one vacation and picked up eldest.