The Flintstones is one of the all time classics of American animation. The endurance and staying power of Fred, Barney, Wilma, and Betty is a testament to the quality of the shows.
The Flintstones was originally aimed at adults, but eventually found its niche as a children's show. The comedy is fairly standard 60s era sitcom material. But is done well and with care.
The prehistoric setting creates tons of opportunities for great visual gags. And the steady stream of "rock" puns are very enjoyable for children.
Perhaps the best thing The Flintstones had going for it was that wonderful, catchy theme song. It sort of burrows into your brain and stays there. "Flintstones, meet the Flintstones." I don't think I could forget that song if I tried.
The Flintstones is a classic show. Good, honest humor and a slice of American nostalgia. Great show.