I don't see how anyone could possibly ever dislike this show. Even though it is a late 60s show, it still manages to obtain an ever-growing fan base, even 4 decades later.
I have often wondered though, was Maxwell Smart's name meant to be ironic? "Max Smart"? I am surprised he wasn't killed 100 times during the show's run - though you can't have a show without the main character can you? And I think making him a 'bumbling' character was part of the charm.
Of course the legendary Don Adams would once again rise in popularity during the 80s with the introduction of the classic kid's cartoon "Inspector Gadget" (which I always felt was a "spin" on 'Get Smart').
Classic stuff all round.