Fans of The Lord of the Rings books often complain about the changes made to events and characters for the films. Yeah, they were successful, but many of the deviations they made from the original texts were unnecessary and unwelcome. There are some changes you have to make when switching mediums because the method of storytelling is different, but not all the changes made in adaptations are actually necessary - sometimes they are done so the story can reach "a wider audience", which can often mean changing characters so they are more conventionally appealing, changing the story to give it a happier ending, or any number of things which the studio might think may make it more profitable. Sometimes I hate it when they do that, other times (Fight Club, for example) I find myself liking the film version more than the original book. In The Hunger Games case I think the first film weakens the character of Peeta without good reason, which I find annoying; on the other hand I keep hearing the third book is not well-liked, even amongst long-time fans of the series, so I kind of hope they use a bit of creative license there.