The Hunger Games
My kids are fans of the books, so of course I've read them too. Good books, excellent for teenagers. I enjoyed them, but didn't think they were 'wow'.
I suspected that the film would be rubbish. The books are fairly gritty - set in a dystopian future, they don't pull any punches. There is everything that happens in under real oppression, from starvation, mutilation as punishment, mass executions, and people selling themselves for food. Not just trading sex for food with guards, but selling 'tickets' in the annual lottery, where teenagers are picked out to fight to death for the entertainment and oppression of the masses. This is something that isn't explained in the film; every teen gets their name once in the 'hat'. But they can 'buy' credits by putting their name down more than once.
Anyway, I thought that would be not translated to the big screen. I was wrong. Sure, there is a lot left out. But it rates as one of the best adaptions of a book to the screen I've ever seen.
Best to read the books first, tho', or you won't have a clue what is going on.