You mean how faillible they were? I recall many stories were about how someone died or had an accident because of overzealous or faulty interpretation of the laws... :)
Huh, maybe. I interpreted it as Asimov showing how perfect the rules were, in that the slightest tweak could lead to disaster.
No, the point was that they were detective stories about robot bugs. People who don't understand why people like "sitting in front of screens all day" should read that book to get a sense of how exactly looking at a core dump could be fun.