Isaac Asimov's books and stories were about why his laws were bad. The three laws are bad, wrong, and do not work. As illustrated by the man himself.
You don't know much about Isaac Asimov. He has stated in several occasions and at the foreword of many of his books that he created the three laws as a response to all the evil robots of science fiction. That it is insane to assume they would turn against us, that we'd have safeguards which would keep us safe, and that we should absolutely build artificially intelligence once we had the technology to do so. Here's one quote on the subject: "One of the stock plots of science fiction was that of the invention of a robot--usually pictured as a creature of metal without soul or emotion. Under the influence of the well-known deeds and ultimate fate of Frankenstein and Rossum, there seemed only one change to be rung on this plot.--Robots were created and destroyed their creator; robots were created and destroyed their creator: robots were created and destroyed their creator-- In the 1930's I became a science-fiction reader and I quickly grew tired of this dull hundred-times-told tale. As a person interested in science, I resented the purely faustian interpretation of science."
The three laws were written with ambiguity not because he wanted to show rules didn't work and our ego of thinking that we could create such rules would be our downfall (the Faustian interpretation he decried above), but because he wanted to make sure there would be some sort of conflict for his stories. However, the rules worked. Most of the time the conflict was a result of the imperfection of humanity: the robots were doing the right things, but we wanted to do something stupid/selfish/prejudiced.
At no point were robots meant to be feared. When their three laws appeared to fail, the moral of the story was always that they hadn't and were working perfectly well. That there was method behind the apparent madness. When a robot appear to lie, despite being ordered to tell the truth (thus apparently disobeying the second law), it lied because it determined the truth would be emotionally harmful to you, and it couldn't disobey the first law.