Oliver Bateman Does the WorkVerified account

90% of the time, perhaps 99% of the time, your typical 60 or 90 minute documentary is less informative than a wikipedia article that can be skimmed in 3-5 minutes

occasionally these things compile footage of real characters that needed to be preserved for the record, or they're made by someone like werner herzog or errol morris or penelope spheeris, or they contain "new revelations" and fresh interviews with major players...but usually not