This series is fairly accurate in its portrayal of Wall Street history. However, there is a clear bias in the narrative crafted; Wall Street and banks are evil and the federal government is the good savior. They rightfully highlight unethical business practices by bankers but fail to show any of the corruption of the political elite who were just the other side of the power-struggle coin. The series promotes the Roosevelt/SEC as the white knights who save the day, yet ignore the decisions by both that prolonged the Great Depression by seizing control and retarding markets.
There is then a convenient time-jump that ignores decades of political ineptitude (40s, 50s, 60s, and 70s) in an attempt to jump straight to Ronald Reagan's presidential term, and then vaguely allude that Regan was responsible for some relatively unknown criminal Wall Street players in the 80s. This series starts off really well, before delving into tired apocryphal narratives.
To be clear, there is no direct fabrication in the series. What they show is factual. There is just a very clear bend in the story-telling that feeds a popular post-modern theme.