I’m not terribly familiar with the franchise personally. I had twice tried and failed to get into Fallout 3 back when it was released, and I’ve seen a video or two elsewhere (I think Hbomberguy did a video on a couple of the games a while back).

This video goes through every single game in the series (including Tactics and Brotherhood of Steel) sequentially, starting with the main game and then each expansion/DLC. He talks about story and gameplay, but also about the stories of their productions, the various influences that inspired the general feel of the universe, successes and failures, and how the identity of the series shifted as it changed hands.

So to answer your question, the highlight is that I feel like a certified expert without ever having really played any of the games. It’s also just ultimately 9.5 hours (7.5 confirmed) of high quality critical content.