Both the first and second seasons are also what most people think of when they start talking about Miami Vice (if that's a thing that happens?). It doesn't have the darker tones of the latter seasons but does manage to have a bit of grit, even if it was neutered by censors.
That does get me wondering about how the show might have been different had it aired on a cable network instead of NBC. Would it have been more like The Wire or The Shield? Who knows? It might not have turned out to be the cultural phenomenon that it ended up being, but a girl can dream.