Timeline, among many others, is a perfect example ... I still remember the first time The Sparky and I saw the preview, months before the movie came out. We had both read and loved the book and knew that it would make an awesome movie. Of course we made a point of going to see it as soon as it was released ... MAJOR DISAPPOINTMENT (yes, that all needs to be in caps, I'm considering bold and underline as well just to make my point).
Why this trip down memory lane you ask? I've just finished the latest, and sadly last, of Michael Crichton's books Micro. As my mind wandered through what may or may not have ended up being a good book review, two thoughts kept coming up:
1 - quite simply, if you like Michael Crichton's work you'll like Micro, if you don't, you probably won't; and
2 - in the right hands it would make a great movie (emphasis added by me for reasons set out above).