I rarely like the movies made from books I've read. Starship Troopers made me cry. Really. I haven't seen the Narnia adaptation and I probably won't. When I heard V for Vendetta was coming out, I went out and didn't reread it. I like to be as vague as possible on the text source when I see the movie. I'm leaving Stardust on the shelf for now.
I really enjoyed Children of Men. Great movie, interesting philosophical implications, yummy Clive Owen. (I might as well stoop.) So, movie safely enjoyed, I began seeking out the book. I heard they didn't even do a movie edition the promotion for the movie sucked so much. I figured PD James was a big enough author that the book would be easy to find anyways. Two months later, I saw a movie copy and snapped it up. CO cover. I generally disdain movie covers because it makes me feel like a band wagon jumper, but the Viggo Mortensen cover of Return of the King enlightened me on some of the benefits.
The book is enjoyable, but radically different from the movie. There are characters with the same names, no kids and it's still England. I'm so glad I didn't read this book first.
Possibly as a part of learning to accept change gracefully, I could accept wildly different movie adaptations. As Orson Scott Card says, the movie doesn't kill the book. The book is still there, waiting for you when you get home.
Frequently, they cut out bits that I love. I know that I'm strange and my tastes aren't mainstream. When I go to a special art exhibit, my favorite paintings aren't among the post card selections. Or posters, notecards, magnets and other crap.
I think I get so resentful because of the reminder that I'm not marketable. Generally, I actively encourage this, or it at least occurs naturally. But it's occasionally painful to have my face ground in it.
There are benefits for playing by society's rules and penalties for not. But most of the time I like to pretend it's not a game.