We never had re-runs of The Prisoner when I was growing up, so I've never seen an episode of it. What I know about it is two things: a) all my friends who've seen it, love it and b) it was cancelled before it ever revealed what the heck was going on. I'm afraid that b) has always overshadowed a) and kept me from being too interested.
But now, Christopher Nolan (Memento, Batman Begins, The Prestige) is reportedly very close to signing a deal with Universal to direct a movie version. I may never know (or care) what it was like to watch the original series, but I'm always up for a Nolan film so this is close enough.