A great collection SF, but not the best of Asimov

I will dare to put a 3 star Asimov, in somewhat provocative, not because it is bad or poor, but because the author has given us a much better stories in the cycle of robots (actually in labsolu, it is 4 stars certainly well!). We feel here that this is his first novel in this regard and sessaie slowly. This is a collection of short stories, allowing Asimov dentrer gradually and more and more deeply in the thick of it.
What author anyway! This is always exciting; but if you really want to enter the universe of the author, take one of the other cycle (robots dawn for example). Foundations or read the cycle in its entirety!
The interest of this collection it may be historic: this is probably the first (or the first) that he wrote on the subject. But it's still in lAsimov that is to say the quality.