Look how deep the Saville investigation ended up going, whilst there well may be people in that book that are completely innocent, there will be some that knew and turned a blind eye.
Thought it was very good - but would echo what Faz said too - you could do with watching Far from Home as a minimum - if you watched Homecoming and the last 2 Avengers Films it would give you more understanding as a whole but not essential.
I totally agree with your second paragraph - the intent to rattle through things so quickly is so frustrating (something I see at my daughters school too who teach a topic in 3 lessons I would spend 2 weeks on) some schools have an obsession to teach the whole curriculum in a year at breakneck...