There are a few. Big Fish was a brilliant adaptation, giving far greater depth to the characters, and I much prefer Watchmen as a film, the characters are just more likeable and the ending is a huge improvement.
The thing is, the adaptation is just the director's ideas from a novel, mixed with those of the screenwriter and various other people, so what you get is an amalgamation of ideas which aren't likely to coincide with yours. If you look at the two as separate works, you'll probably enjoy them more. Take the Bone Collector, the characters are all messed up between the two works, but both work well on their own. You get hung up on details if you focus on the adaptation part.