You should be aware that the first two seasons were broadcast in black and white. You really have to love the series to appreciate the somewhat corny nature of the dialog and sets. It wasn't until the later seasons that additional funds were made available to increase the production values, including a greater reliance on the techno-gadgets; some of the toys were really elaborate and ridiculous, but that's what endears the audience to the show.
David McCallum is currently on the TV show NCIS and in one of the episodes, Mark Harmon (Jethro Gibbs) is asked what Ducky (David McCallum) looked like when he was younger. Harmon answers, shrugging his shoulders: "Ilya Kuriyakin?" What a hoot.