My thing about ACC is that most people only remember him for that one line, when he also gave the world 2001, Childhood's End and more, not to mention being perhaps one of the greatest intellects of the 20th century.
And he invented the concept of the communications satellite, so modern society owes him an enormous debt. (Although I suppose someone else would've thought of it soon enough if he hadn't.)
I don't really consider 2001
one of Clarke's greatest works, though. It's just better-known than most because of the Kubrick film. His top two are probably Childhood's End
and Rendezvous with Rama
, and The Fountains of Paradise
is pretty high on the list.