In each of the eight bio-docs, we explore a particular Wrestling superstar. Because these are written and funded by the WWE, they have interview with everyone involved at every level. This includes all the wrestlers and staff (included AEW and TNA) and celebrities like Mr. T. Vince McMahon is also interviewed. They have footage from all there matches in almost every promotion to use and this makes for a very colourful and varied story from lots of angles. Add to that the high production values, HD quality cameras and sound. Its just fun to watch.
However the flip side is that WWE can do no wrong. Certain controversial topics may be discussed; but its entirely the performers fault and WWE accept no blame. Even when we know from watching other docs like Dark Side of the Ring they had a hand in it, here they only say "nice thing" (quoting Vince McMahon from the episode about Rowdy Piper) outright admitting he was refusing to talk about the uglier stuff.
Having said that, the stories they give from the individual performers are fantastic. The journeys were well-picked for having substance to them making great documentaries.
Hopefully they will explore others that haven't had the spotlight yet in series 2 that I think have rather interesting stories to tell like: MVP, Lita, Kevin Nash, Scotty 2 Hotty, Shane Helms. Kane, Jake the Snake, Big Boss Man. Davey Boy Smith.