He was one of The Good Ones…an excellent storyteller and, from all I’ve ever heard, one hell of a nice guy too.
I liked the Dragon and the George (not the sequels), some of his Hoka! stuff was fun and I’ve read some of the Dorsai books, but my favorite of his works was a short story with a title like “Danger: Human” or “Humans! Beware”. The upshot was that there were legends throughout the galaxy of this race of bipeds. It looks harmless, but they’ve taken over the galaxy four times, create a huge empire which ineveitably collapses. They’re hunted to near extinction, but a pocket invariably survives and the cycle begins again. The legend concludes that if you discover any pockets of this race, you need to nuke them into non-existance. Whatever you do: do not touch! Keep Away!
Of course, a group of aliens discover Earth. They grab one ordinary guy, to study him to see why he’s so dangerous. They put him in a metal cage on an island in an acid filled moat with armed guards around the moat, lightyears from Earth. Only one guard at a time delivers food to the guy through a tiny slot. The conclusion is fantastic and I don’t want to ruin it, but if I ever made an anthology of the best short SF stories ever, it’d be included.