One negative for traditional thriller fans is this will not resolve itself. Zodiac was never caught and may have died at this point. The nice wrapped up package you get in most movies is not here. You are left with your own thoughts and opinions on the possible killers. They focus on two possible suspects in this film, Arthur Leigh Allen and Rick Marshal. There were others considered like the uni-bomber that do not make it into the film.
I am really not knowledgeable about the case and was often left with several questions. Who was Bob Vaughn, he seemed awful creepy in the movie. Why is there no new case using the modern forensics we see weekly in Criminal Minds? Why were the police departments so concerned with jurisdiction?
All in all pretty fun and intriguing. The Zodiac case is just good material really, the unsolved nature and the police taunting cryptograms make it powerful and engrossing