Great stuff. There is a brilliant episode where Number 6 is shunned as being "un-mutual" with an opening in what is a frighteningly accurate portrayal of a re-education camp self-criticism group. That scene would be familiar to several generations of college students. If you want one key to the series, it's right there.
Only one of the episodes strikes me as dated, and it is where Number 6 manages to defeat a digital master computer by (ugh) typing the question "Why?" onto a sheet of paper and feeding it into a slot. I've seen a lot of computers in my time but I'm still waiting for one of them to start smoking when I give it garbage input. They do occasionally give me the right answer, though: "Because I'm in charge and you piss me off."
There is another episode where Number 6 runs for office that will make us all squirm in this election year. I shall say no more.
Found this thread. I posted on it in 2016, saying it was time to watch them all again. Started before Christmas and just finished today. Just as brilliant. Yes a couple of episodes were not that great, but overall brilliant. Certainly fits the deep state example today.