I enjoyed the book immensely, but then I enjoyed the movie as well. For $1 you got a real bargain.
I don't think you will be disappointed with the adaptation, if I was asked to categorise it as good or bad. I'd have to say, to use the parlance of the book, that it was a..
(If you find strong language offensive do not open the spoiler, or read "Dreamcatcher")
I like the book and thought the movie was an okay adaption- the first part showing the friends together is great but after it the army shows up it's kinda loses it for me. I can't get over the eyebrows that Morgan Freeman is sporting in his role- what were they thinking???? They're scarier than the Ripleys!
The book is one of my faves, but I think this adaptation is actually pretty good. I own the movie and rewatched it recently and was surprised at how closely it followed the book, except the end!!! But I really liked Damien Lewis and Thomas jane(?)
While I enjoyed much of the early part of Dreamcatcher (the book), I felt it lost its way when the army got involved and, overall, didn't really work. The film made a valiant attempt to capture the book but, inevitably, followed a similar rather rambling and unsatisfactory path through to its conclusion.