Genius. What else can be said? I can't even fully conceive of the level of intelligence to be able to write with such a grasp on technology that even over sixty years later, the book still feels contemporary and relevant.
It's often said that when a movie is adapted from a book, the film often falls short. In some cases, like this, to even give the movie the same title as the book is actually an affront to the original author. Other than some characters with the same names and the use of Asimov's three rules of robotics, pretty much the only similarity between the book and the film is that they both have robots in them.
And I don't intend this to be disparaging of the film. I just think that the film makers should have just made the film their own instead of trying to inherit some notoriety by association to this classic book.
While a collection of short stories, Asimov still manages to create the feel of a larger cohesive story. There are plenty of gems to be gleamed from this collection but my favorite by far is the debate between the robot and the human in which the robot argues in pretty convincing fashion that the humans could not be his creator and that they themselves are merely imperfect constructs lacking self awareness; brought into being by the same creative being which made robots.
Anyone with the mildest interest in science fiction should read this just out of principle. Anyone who loves literature should read this because it is just that good.