As it is a documentary, there is not much to review really - the producers who were involved back then are telling stories from production era. The whole movie is very well done.
But what it really means to me? The Batman animated series holds a significant spot in my childhood. I was circa 4 or 5 year old back then, when this show was airing on our television every morning. Remember, it was the mid 90s so we couldn't even dream about streaming services or "pirating from the internet". All we had was a regular CRT tv-s, which were usually 21" in diameter and a broadcast cable that didnt even come close to picture quality of today. Also only rich people had VCR players and video-cassette collections.
So anyway, people who weren't alive back then get the picture - only way to watch cartoons was on tv, and without any rewind or re-watch options.
The Batman animated series was on TV every morning, about 8am, so me and most of the kids were already in the kindergarten. Somehow we managed to negotiate a deal with our teacher that if we sneak into the banquet room downstairs (that was the only room in the whole kindergarten that had screen, apart from principal's PC) and nobody knew we were there, we were allowed to watch morning cartoons if we were quiet.
Needless to say, me and about 5 or 6 kids were there every morning and watched The Batman. And even today, about 30 years later, i still love that show and sometimes watch it when i'm having lunch of work. #NERD.