Manage your expectations I am always apprehensive about seeing a screen adaptation of a beloved book, so I was almost afraid to see this. I've read all the 'Hitchhikers' books at least three times and I love Douglas Adams' humor. I'd also seen the BBC series many years ago and loved it. So, we bought the movie yesterday and watched it last night. I can't imagine seeing the movie without having read at least the first book...it just wouldn't make any sense. In a nutshell, I found the movie at least as zany as the book and imbued throughout with Adams' wacky sense of humor and sarcasm.
NPR ran a Talk of the Nation segment on the movie/book, etc. on the day before it opened and talked to many people who were either involved with the movie, were Hitchhiker 'experts' (how terrifying is that??) or mega-fans. Some liked it, some didn't. The main thing that came out, however, is how very involved Adams had been with the screenplay, etc. for this venture. It had been in the works for years prior to his death and it was his baby. I think the producers did it right.
If you're going into this movie with the idea that it will be a line by line adaptation of the book, you won't like it. If you suspend your expectations and look at this as a merry romp through absurdity, you'll love it.