He was a hell of a writer. Pretty much everything he wrote was golden. Something for everyone too :
Huge interlinking backstory linking many of the characters together,
Plenty of young scifi books (Starman, Space Cadet) that explained very complex ideas very simply
Thought provoking books like Starship Troopers (yes really !)
I may well have to add one to the queue after Guardian and Hunger Games …