Movies never do the book justice.
Oh come on, never? 8) Anytime someone says this there's such an air of superiority about it.
Movies better than the book (or
at least equal):
Schindler’s List.
No Country for Old Men.
Atonement.
Mary Poppins.
Apocalypse Now.
Dr. Strangelove.
Trainspotting.
Who Framed Roger Rabbit.
Death Wish.
Jurassic Park.
Rambo.
Silence of The Lambs.
The Thing (John Carpenter version).
Tell No One.
Bladerunner.
The Children of Men.
A Clockwork Orange.
The Exorcist.
Psycho.
The Taking of Pelham One Two Three (referring to the 1974 original film, not the recent remake).
Girl, Interrupted.
The Godfather.
2001: A Space Odyssey.
Diehard.
Fantastic Mr. Fox.
The Diving Bell and the Butterfly.
American Psycho.
The Prestige.
Zodiac.
The Shining.
A History of Violence.
High Fidelity.
The Shawshank Redemption.
Requiem for a Dream.
Fight Club.
Scarface.
Forrest Gump.
Ben Hur.
The Wizard Of Oz (the classic 1939 version of the film, of course).
Shrek.
Jaws.
Road to Perdition.
The Graduate.
Planet of the Apes.
& a whole bunch of Disney movies.
Many of those are classic films from sub-par books.
Obviously they often change things going from the book to the film, but that's because films fundamentally work very differently than books in the way they tell their stories. A straight adaption from book to movie would often not work too well (most likely at least end up with terrible pacing). That doesn't somehow make them worse.
I think often times the problem is when people read a book they have certain ideas about the character -the way they speak, or their mannerisms, their appearance. Often many who read the book get very different views of the same character, so when the movie adaptation happens it's version of the character is bound to be very different to what many imagined, so many agree they got the character wrong, but can't agree on what would be correct.
Beyond that I think many just like the 'I read the book before the movie came out' smugness of claiming movies are always inferior to films. Movies are just as legitimate forms of artwork & story telling as books. Some books are better than some movies & vice versa.