Masterpiece. As a huge Fallout 3 and 4 fan , they really delivered a great story, an arc that delivered and answered some outstanding questions and a creative way to watch a nice story.
Not Spoilers:
1. The show delivers on who started the war that led to the end of known civilization.
2. The story continues from the Fallout 4 story, covering a new story without having to retell everything. The new viewer may find an amazing lore in the 200 year since the bombs dropped with any content created in the last 20 years.
3. The story arcs are wonderful, not overly complicated and deliver as promised, no loose ends other than more stories to come.