I love this show and everyone I try to introduce it to hates it.
The Prisoner to this day is a groundbreaking, unique show. It's creepy and weird and delights in keeping you off kilter. A psychedelic X Files or a Kafkaesque James Bond. Either way you look at it, it's tremendously better than the new age remake AMC foisted on us.
Here's the opening. It's a three minute title sequence. Three minutes! That's just ridiculous and another reason people hate it.