Sure Patton Oswald being a big part of the intro is a negative. He is one of those actors that gives the whole industry a bad name like those big directors and producers who act nasty. But the doc soon moves to the attacks and murders and they interview victims and family members.
The attacks themselves are very old unsolved cases so there was not much story there. Just a bunch of guesswork. But once they get to the DNA evidence the whole thing becomes world news. They used his crime scene DNA to look up relatives. Then follow him and pick up some trash he throws out and discover that he is the killer. That is the main story in the doc and what should have been the focus with the victims then telling their stories around that.
The attacks themselves are very old unsolved cases so there was not much story there. Just a bunch of guesswork. But once they get to the DNA evidence the whole thing becomes world news. They used his crime scene DNA to look up relatives. Then follow him and pick up some trash he throws out and discover that he is the killer. That is the main story in the doc and what should have been the focus with the victims then telling their stories around that.