I love dark side of the ring. I really do. I've always been big on both documentaries and wrestling, and will gladly gobble down any wrestling documentary that isn't 4 hours long.
With that said, I can't help but get the impression that some episodes are essentially glorified hit pieces that present many pieces of information inaccurately or from a biased perspective. The wrestlers don't get to defend themselves when shed in a bad light due to them typically having no direct involvement in the series.
Although I can admit I'm probably being a bit too nitpicky and I might be confusing Dark Side with some of the documentaries by Spotfight. They typically do a good enough job with their research to where none of this is a big concern and they don't always shed people in a bad light either. They also use interview footage if they can of wrestlers admitting to their mistakes, which is good.