Since I'll be offline at home I might as well join the discussion based on previous viewings.
I've got to confess right now I really like the Bond books and would have been happy to see films follow them as closely as possible. Not that I don't like the full-on Roger Moore era - I treat the different film Bonds as different characters. Anyway, I think Dr. No is about as close to the book as Bond films could ever get. (The first book was actually Casino Royale).
Very little actually differs from the book, except I remember the big exploding complex and evil plot behind it being significantly different. The film itself could scarcely be more different to the 70s-80s action extravaganzas that make up the Roger Moore Bond era. This is in the style of the classic Cold War spy thriller, with much intrigue and scene setting. I suppose this does look slow when compared with more recent films, and the action isn't as OTT, but that fits the style of the era, as well as the books, which were far-fetched in their own way. It also establishes a good many of the features that recur in the subsequent Bond films.
I love Sean Connery as Bond. He plays the role very straight, with sufficient presence and dignity to carry off the image of a society gentleman of the era, which is what Bond is meant to be. The accent is actually a nice nod to Fleming's Bond too, who had a Scottish parent.
The film (and Fleming's story) contrasts sophisticated society and its luxury trimmings, with the wild beauty of exotic locations like the Caribbean. Incidentally, this has parallels with Bond's taste in women, too, and Honey Rider (Ursula Andress) has the honour of establishing the concept of the movie Bond Girl. Honey walking out of the sea has to be one of the best known Bond film moments, if not reasonably iconic in cinema history in general. So much so that they tried to do a role-reversal with Daniel Craig's Bond being the one in skimpy swimwear in the 2006
Casino Royale. (Incidentally, the Honey Rider of the book was topless and had a broken nose. When she realises Bond is watching her, she covers up her nose to preserve her dignity
).