Is Making a Murderer a real documentary?

The key part to recognizing or analyzing improper situations is noticing out of character interactions. Making a Murderer has dramatic elements. When the defense attorney was questioning the FBI agent on the stand, the defense attorney’s approach was not unlike badgering. That sort of a approach only happens on television. This is strange since it isn’t a reenactment. So who was the audience at the time? Steven Avery?