I think you mentioned the old BBC series in another thread, right? That was actually much closer to the books than the new movie, but I think that sort of stifled the acting in it. To be honest, as much as I love the books, I'm the first person to agree that a book doesn't always translate well to a film without a lot of tweaking.
Which is why, even though the new Hitchhiker's Guide film is different from the book in several respects, I actually like it more than the BBC series. Having said that, like any other fan of the Guide books, there were scenes that I really hoped would have been in the film that were cut out.
On the other hand, I just enjoyed watching Zooey Deschanel onscreen for 90 minutes.