Occasional glimmers of the real Adams magic shine through, particularly in the scenes between Martin Freeman and Bill Nighy. The narrated "Guide" sections are amusing, thanks to Stephen Fry and some witty animation. Alas, the obscene incompetence of Mos Def as Ford Prefect and Sam Rockwell's ill-advised George W. Bush impression are just appalling. A sadly missed opportunity.
It wasn't that bad, but it often felt very awkward to watch. The book was hilarious to read, and I really loved it, but when I watched the movie adaptation, it just didn't seem that funny anymore. The movie retains the silliness, but somewhere along the way it lost the humour.
Not as great as the book and not as endearing as the television series but still a very solid, very Adams entry into the canon. I like it a lot and it makes me sad that we'll likely never get any of the sequels.