It is informative albeit the info is too selective as I will describe below. Its low pace make you bored sometimes. Besides, the transition periods are kept longer than needed and this increase the feeling of boredom.
Its reenactments are very realistic and needs to be appraised.
However, there is a very strong bias implicit in the selection of incidents. I am normally not and don't want to be a politically-driven critic but here, the producers seem to act politically-driven. Please look at all the episodes -- All are "muslim"-driven atrocities. I, like most muslims would do, condemn these acts. Yet, making such a documentary but selecting events with solely one-type of perpetrator casts doubt about the intention of those producers. This at least funs the flames. I protest.