For a movie about Madoff the main thing is the story has to be linear, non confusing and thorough and this 2 part miniseries succeeds. It introduces enough characters one by one to show the major players in the scandal, how the business duped clients and how it came crashing down. It isn't too complicated so non finance people can roughly understand what happens. Madoff is made to be the narrator of the movie and it helps to make things clear. Victims, clients, whistle blowers, the SEC dropping the ball, and the perpetrators in Madoff's company are all shown. The look at what happened in Madoff's own family is quite fascinating. His wife kids brother niece are all shown to be unknowing victims. The tragic suicide of his son Mark is quite moving. Would have liked a bit more about the recovery of the stolen money at the end.
The acting is fine. With so much going on in the story the main thing is that they should resemble the real people sufficiently. Richard Dreyfuss looks enough like Madoff and his benign slightly jovial approach actually is quite right. It keeps things flowing and not too depressing. Blythe Danner is physically suited to the role of Ruth. The actors who play his sons are don't look like them much - not great casting there. The supporting cast are good too especially those who play his staff.
Will be interesting to compare to to the upcoming HBO movie with Robert DeNiro as Madoff.
There was a follow up ABC documentary with interviews called "Bernie Madoff after the fall" that aired after the end of part 2 that is worth watching.