I was never a big fan of Asimov, for some reason. Or any of the Big Three, for that matter.
I've read a number of Asimov's works, but they never left much of an impression on me. The last Asimov novel I read was The Gods Themselves
, and I couldn't even tell you what that was about.
I was always a fan of Larry Niven, as a kid, in the 70s and early 80s, and got into the Cyberpunks as a young adult, in the late 80s and early 90s. Compared to them, Asimov's work seemed old-fashioned, dated, and even dull--at least, to me. YMMV, of course.
I do give him credit for his big ideas, as Australis
mentioned. Among other things, it was a non-fiction article by Asimov that gave Larry Niven the idea for one of his very best short stories, the Hugo award-winning "Neutron Star." Asimov himself discusses this here