Have read all of them I could get my hands on. There are something like 47 books, some with multiple stories, so you have a lot to look forward to.
IMO What Stout did was to combine elements of American
Black Mask crime drama with elements of English parlor mysteries. It took a while to get used to because I expected there to be a succession of clues that if interpreted correctly would reveal the correct suspect, but that is not true of all his books. Some of them are more like "true crime" adventures than traditional murder mysteries.
Unlike a lot of series, where the sidekick is just there as a mute sounding board for the protagoninst, Archie is just as important a character in the books as Nero. The interaction of their personalities is wonderful. Personally, I could just read exchanges between Archie and Nero
ad infinitu without there even being a mystery.
This is an interesting bit from the Wikipedia article which explains a lot about Nero's character:
"I got the idea of making Wolfe a Montenegrin from Louis Adamic," Stout told McAleer. Everything Stout knew about Montenegrins he learned from Adamic's book The Native's Return (1934), or from Adamic himself, McAleer reported.
"Adamic describes the Montenegrin male as tall, commanding, dignified, courteous, hospitable," McAleer wrote. "He is reluctant to work, accustomed to isolation from women. He places women in a subordinate role. He is a romantic idealist, apt to go in for dashing effects to express his spirited nature. He is strong in family loyalties, has great pride, is impatient of restraint. Love of freedom is his outstanding trait. He is stubborn, fearless, unsubduable, capable of great self-denial to uphold his ideals. He is fatalistic toward death. In short, Rex had found for Wolfe a nationality that fitted him to perfection."
Now you've interested in the books again. Will have to locate a few used copies. And once you run out of Rex Stout,
Robert Goldsborogh had an amazing talent for recreating Sout's style.