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I think that adding more evidentiary support such as data analysis r statistics would have enhanced this video's educational value. It would have shown the physical evidence and the magnitude of the disaster. I also believe that citing more government officials and getting statements from more hospital workers, doctors and first responders would have given this film a more well rounded and accurate depiction of all sides of the outbreak. 

This article was published in Public Health Reports, this is the official journal of the US public Health Service and Surgeon General of the United States. Topics and issues of public health law, public health practice and research as well as schools and teaching are published in this journal. Overall, this journal is highly regarded. It is peer reviewed and publishes original work. Being the official journal of US departments reflects its validity. 

"In any number of disaster over the past two centuries, the "disaster investigation," far from proving itself the dispassionate, scientific verdict on causality and blame, actually emerges as hard-fought honest is to define the moment in politics and society, in technology and culture."

"history shows that, with time, a given community of engineers and scientists has generally proven able to explain the technical particulars of a structural collapse."

"By reviewing the history of disaster investigations in the US, we therefore gain a broader context for understanding the early pitfalls and the future prospects for the World Trade Center investigation,"

I would say that a situation where this site would be difficult to work with would be in an urgent, or time sensitive situation. Let's say during a situation where quick medical care is needed, this site would be difficult to work with and not a good source of information during that time. Yet in most situations and settings this would prove to be a good source of data.