I am a big fan of DC comics. I love their characters. I love Superman, Batman,Wonder Woman,Green Lantern, etc. Now as a comic book fan, I am pleased with this and I can show this to people who are not comic book fans. I'm surrounded by people who are not comic book fans, who think Marvel is better than DC. Which pisses me off to no end. I'm not dissing Marvel, I just hate how the general public thinks of it.
With this we get the history of DC comics. Where it started with one title to franchises. We get to see how Superman and Batman became part of the pop culture. We see how comics evolved. We get to see how comic books came into other media such as movies and cartoons. I know a lot people have this complaint, but they skip over major events such Crisis on Infinite Earths and Zero Hour and the New Teen Titans comics were also a big part of DC comics history since it was one of the most popular comics of the 1980s.
Overall some things are not mentioned, but then again most comic book documentaries are like that. I could show this to people who aren't comic book fans or Marvel fanboys, is that without DC comics, we wouldn't have the first Superman movie, we wouldn't have Christopher Nolan's Batman films and without DC we wouldn't have companies such as Marvel,Image,Darkhorse and many more.