Well, it's been my favorite show for over 20 years, so I'm a bit biased. I'd say that if you have access to it, try watching a little. People in the fandom are usually pretty happy to give a list of old-eps for a new watcher, or just start with the new series (from the beginning of the 2005 season). It's a slightly-cheesy, very British, family sci-fi show. The good guys win, the bad guys lose, and the special effects aren't very good, though they're better in the new series.

As for today's batch of secrets -- It's a show with a hero that goes around picking up ordinary people to travel with him. It does sort of invite self-insertion, and shipwars between people who ship him with various of his tagalongs.