I know close to nothing about the NFL but I still very much enjoyed this series. I don't know the rules, terms or anything. I don't even know how the scoring system works.
It's a very good insight into the life of a worldclass athlete in a sport I know little about. Not only have I learned more about NFL but also the mind of different athletes.
I understand if some people would like an introduction to the rules but that would put off actual football fans. You don't have to know the rules, because the music and narration will tell you when they do good/bad. It's more about the players' psyches rather than the sport itself.
Very well made series in all aspects. If you are a fan of sports you will enjoy this. Netflix has been doing a great job with their sportdocs recently.